The long awaited gap transportation Raw Review Roundup is finally here! We've been piling up the miles on these machines for the last several months and there are a few clear winners.

Gap transportation usually serves to get a commuter from mass transit to their destination. Since gap transportation machines often need to be carried onto trains and buses, they should be light and compact. Typically, there are some trade-offs to make something both fun to ride and easy to carry.

Without further ado, here are the contenders and their rankings.

Top Tier:
Dahon Jetstream P8 folding bike
Riese und Muller Birdy 2 Monocoque folding bike
Dahon Mu P8 folding bike

Middle Tier:
Riese und Muller Frog folding bike
Ross Motors 2000XR electric scooter
REI Novara Buzz FlyBy folding bike

Bottom Tier:
Schwinn Stealth R electric scooter
Bladez 450 electric scooter

The rides were compared to non-folding reference bikes and used on surfaces including gravel paths, suburban streets, and pothole-infested urban pavement.

Dahon Jetstream P8: The Dahon surprised us here at RawEco by scoring solidly into the top tier with a great combination of performance, comfort, portability, and style. Why were we surprised? Typically in large cities, the folding bikes you see are of the "hardtail" variety: utilitarian machines that get you there with minimum impact on your wallet... and maximum impact on your spine.

The Dahon, equipped with a good elastomer front suspension and an excellent air shock rear suspension, gets you there with tailbone intact and ready for a day's worth of work. It's not designed for off-road use, but we couldn't help ourselves and took it for some light trail work. While the Schwalbe Marathon Racer tires on the Jetstream are definitely optimized for road use, the bike itself did admirably well on dirt and gravel.

The Jetstream is fairly priced and relatively lightweight at ready-to-ride 25.5 lbs on our scales. Twenty-five pounds may seem like a decent load to carry, but it's quite reasonable for a full-suspension bike, and this one happens to fold to a compact package that easily fits in the trunk or back seat of a typical sedan.

We found folding the Jetstream to be intuitive and the easiest of all the frame-hinged bikes. We definitely liked the frame hinge design compared to the Mu and FlyBy.

Frame hinges are located in the middle of a bike frame and allow the bike to literally be folded in half. The advantage of a frame hinge is that it allows for design flexibility and simple folding. It also has the distinct advantage of leaving the bicycle's drivetrain unmolested during the folding process. We'll revisit that in more detail in the Birdy review.

The disadvantage of a frame hinge is the vague concept that having a hinge in a structurally important part of the bike may lead to potential failures down the line. On one hand, this makes sense to some of us here at RawEco, especially the engineers. The hinge folds the bike sideways, but your weight is trying to crack the hinge downwards.

That being said, it seems quite feasible to design a hinge and frame that is strong enough to withstand the relatively puny forces that a human can exert jumping off curbs and hitting potholes. Furthermore, research here at RawEco has only located a handful of individuals who have reported hinge failures on frame-hinged bikes, and those are typically on low-end steel framed bikes, some of which may have been exposed to saltwater corrosion. The Dahon representative we spoke with noted that hinges, like many mechanical parts on a bicycle, should be inspected and adjusted over the years.

Of all the folding bikes, the Jetstream rode most like our reference bikes. That's quite a compliment, given that our reference bikes include high-end XTR equipped Specialized Stumpjumper FSR full-suspension mountain bikes and the same carbon-fiber Trek model that Lance Armstrong rode to victory in the Tour de France. We love our bikes here at RawEco, and we definitely love the Jetstream.

Pros:
Plush, adjustable rear suspension
Great brakes
Good SRAM drivetrain and gear range
Intuitive folding

Cons:
Non-adjustable front suspension is too firm for riders under 130 lbs

Other observations:
Retails for around $999
Feels more stable/less nimble than the Birdy
Geometry and components make it feel like a big, full-sized bike
Small magnets hold the bike folded shut, but when they accidentally detach, the bike can feel like a limp noodle
Can roll when folded, but the magnets will sometimes detach. Bring a small bungee cord if you plan on rolling it a lot while folded.
Invest in a shock pump (~$15 and up) to tailor the rear shock to your weight and riding style
Pump the tires up to their maximum pressure and enjoy the benefits of ultra-low rolling resistance and the comfortable, full suspension ride. Those same pressures on the FlyBy and Lance's Trek sometimes make our teeth rattle

Riese und Muller Birdy 2 Monocoque: The Birdy looks amazing in specs. Award-winning design designed by award-winning designers. Hand-welded, ultra-stiff, one-piece aluminum alloy frame suspended on dual, customizable, elastomer springs. Amazing, almost artistic folds using the suspension swing-arms to enable compact storage without frame hinges. Legendary stories of people riding thousands of miles on their Birdy bikes through cross-country tours. A cult-like following in Germany and Japan. 25 year warranty.

The reality is still impressive, but it's nearly impossible to live up to the high expectations. That 25 year warranty appears to only be honored in some countries. That beautiful folding act requires smaller wheels and also requires that you to shift to high gear in order to fit the rear drivetrain in. And that elastomer suspension works well, but probably isn't going to deliver the plush ride that some people associate with full-suspension.

Our test ride was finished in a badass matte titanium gray paint job with black handlebars, seatpost and stem. In many ways, it looks like a futuristic, high-tech BMX bike sized for adults. Although there are quite a few stories of people slapping on BMX knobbies and taking their Birdies off-road, like the Jetstream, it's intended as a road bike. Conversely, there are Birdy fanatics around the world who mod the bike to be as light as possible. The current record is at 18 pounds, which is quite impressive for any bike, let alone a folding one with full suspension.

Like most folding bikes, the Birdy arrives in a folded state. As you unfold it for the first time, you appreciate the incredible design of the bike. Folding is equally cool: the rear suspension swingarm folds forwards nearly automatically as you lift up the bike. As it approaches the front of the bike, the swingarm's hinge tilts slightly to the side, and somehow the rear tire, which was perfectly behind you while you were riding, is now tucked slightly to the left of the frame. The seatpost, when retracted into the body, perfectly blocks the swingarm and locks it into place.

The ride on the Birdy is firm, but absorbent. For some people, this is the ideal type of suspension: you only notice it when you're riding a bike that doesn't have it. We wouldn't mind a little more plushness, but it definitely does the job with the stock elastomers. R&M sell several versions of the elastomer and let you choose the ride quality tradeoff that you prefer, but we're not sure even the softest elastomer can provide the travel and plushness that a good air shock can.

The Birdy's Shimano Capreo drivetrain is competent and shifts reliably, and the gear choices are appropriate for a road bike. The v-brakes, while solid, are not as grabby as the Jetstream's set; this can be altered, of course, by using a different set of brake pads.

Folding the Birdy is actually incredibly fast: after the first few times we've been able to fold it in twelve seconds without rushing. You can even fold it without getting your hands dirty by using your foot for the front wheel fold.

There is one issue with the way the Birdy folds, however. You need to put it into the highest gear before you fold it. We've found that putting it into the second-highest gear works even better as the derailleur is more tucked-in, but either one works. The problem is that the highest gear is most likely the gear you don't want when you arrive at your destination and start riding from a standstill. As a result, there's a lot of pointless shifting up and down as you fold and unfold the bike. It's not a dealbreaker, but there are definitely days when you're late for the train and you forget to put it in high gear as you approach the station.

Life is full of tradeoffs, and this is the Birdy's tradeoff. By avoiding a frame hinge like the plague, Riese and Muller (the German design duo) did an amazing job in re-using the suspension hinges of the bike to allow folding. The bike, of course, still has pivots for the suspension, but the weight of the rider is exerted in the same plane as the pivot's folding plane. In the words of some Birdy owners, the forces exerted by the rider help hold the bike together rather than try to tear it apart as with a frame hinge bike.

Over the years, Riese und Muller (the company) have sold tens of thousands of Birdies, and reports of catastrophic Birdy frame failure are extremely rare. That's a reassuring thing, but the tradeoff of having no frame hinge is that the drivetrain takes part when the thing folds. As a result, you need to remember to shift the damn thing to high gear before you fold. The bike won't explode or burst into flames if you don't, but there's a higher chance of minor annoyances like the chain falling off if you forget to do it.

Overall, we love the Birdy. It's like owning a piece of art, and the performance is excellent, as well. We actually prefer the unfolding process of the Birdy to the Dahons as it uses gravity to help you unfold, but the requisite gear-change is a bit unfortunate.

Given a choice of all the bikes we've reviewed, it would come down to the Jetstream or the Birdy. The Birdy is an exceptional bike, but at nearly twice the price of the Jetstream, it really depends on how it fits into a particular budget. There is a more affordable Birdy 1 which does not use the Monocoque frame and starts at a very reasonable $999, but the component choice is somewhat inferior and the older tubular frame design, while solid and proven, is not quite as stiff nor as awe-inspiring as the Monocoque frame.

In the end, $999 for a Jetstream or $1700 for a Birdy is probably money well spent if you're going to ride it instead of driving a pollution-spewing car or truck. You'll be doing your part for the ecosystem, and getting exercise at the same time. Considering that opting for an in-dash GPS system, moonroof, or leather interior for your car will often cost you as much as one of these bikes, the bike sure seems to be the better option to stash in your car (or home).

Pros:
Peerless design and construction quality
Excellent performance, on and off-road
Stiff, no-excuses frame
Interchangeable elastomers allow adjustment for both front and rear suspension
Nimble and light at 24 lbs

Cons:
$1700
Suspension has shorter travel and is not as plush as the Jetstream's
Requires shifting into high gear before folding

Other observations:
Try shifting into the second-highest gear for a slightly smaller fold
The Expedition Rack for the Birdy is solid and folds automatically with the bike
Birdy bikes with hub gears, sold in some regions, do not need to be shifted before folding; in general, we prefer the performance of cog gears over hub gears
With the adjustable-height handlebars, make sure to tighten the quick releases sufficiently

Coming soon: The best of the rest.

Here's a great interview with Mythbusters's Jamie Hyneman giving some behind-the-scenes information on the episode.

http://www.popularmechanics.com/technology/transportation/4264025.html?series=19

It's too bad that Tesla decided to chicken out on this comparison, as it would be interesting to see the Roadster in the quarter mile and also get some well deserved publicity.

The most interesting part is how Jamie describes these electric vehicles as incredibly simple to build, and compares them to oversized remote-controlled cars (not of the glowplug variety, of course). He says he fully plans on building one, and expects it to take only a week or two.

Project Better Place, located in California, recently showed off a working prototype of a pure electric Renault/Nissan car in Tel Aviv.

This is pretty exciting news, as Project Better Place seeks to supplant oil-based cars in the next few years in Israel and Denmark. It's an exciting step forward, especially in Denmark, where the cars will be largely charged by wind generated electric power.

We applaud the more rational choice of making the car a four-door, five seater sedan (though a five-door hatch or wagon would be even more useful to more people). It's a bit unfortunate that the "other" electric car, the Tesla, is based on one of the smallest, most impractical forms possible; didn't anyone tell them that you can have high performance with four seats? Just look at cars like the Mazda RX-8 and BMW 135i. Replace those gas-guzzling engines with an electric drivetrain and you're ready to haul four asses at high speed. Ah, well. We still love the Tesla.

Howdy folks, we've been gearing up and accumulating test miles on our fleet of "gap transportation" in preparation for the good weather up here in the northern hemisphere.

The review is looking pretty complete: we have our trademark and extremely detailed raw reviews on rides like the new Dahon Mu P8, the REI Novara Buzz Flyby folding bike, the high-tech Ross Motors 2000XR, the elite Riese und Muller Birdy 2 Monocoque, the affordable Schwinn Stealth scooter, the Bladez 450 electric scooter and a very rare appearance from the endangered Riese und Muller Frog.

Dahon is a big name in folding bikes, and we're very happy to report that they will be participating with the new Mu P8. As far as we know, this will be the first official review of the hot new ride. We'll update here when it arrives. We'll also be reviewing the new Jetstream P8 when it's available later this year.

Brompton is across the pond, so we'll need to give them some time. We'll update here as things change. Stay tuned for the review this Spring!

As consumers have learned, the Internet has given the little guy a newfound voice when it comes to having dialogs with producers.

Mitsubishi has an i-MiEV electric car that has a 100 mile range and costs about the same as a foreign-oil-burning Prius or Civic Hybrid. The only problem is that they aren't sure about selling it in America. Perhaps its our multitude of F-150's and Hummers that makes them think we're not a suitable market?

Convince them otherwise by signing this petition: http://www.petitiononline.com/iMiEV/petition.html

Tesla Roadsters are nice, but at $100,000 for two seats, they are more of a proof of concept than a real answer to fossil fuel consuption and climate change. This i-MiEV four-door is perhaps a better answer.

Being stuck in mass-transit-lite California, getting around without spewing several metric tons of CO2 is not especially easy.

That's where fun rides like the Roth Motors 2000XR scooter come in handy. The idea behind this stylish, two-wheeled scooter is that it provides enough power and range to get you to nearby places, or the range to get you from your mass transit drop point to your final destination.

We currently have several such vehicles in our corral, awaiting their own Raw Review: a cheap but plush Schwinn Stealth 1000 electric scooter, a stunning Riese und Muller Birdy 2 Monocoque folding (and hinge-free) full-suspension bike, and a Bladez electric scooter. Also waiting in the wings is a green (literally) Toyota Camry Hybrid review.

Today, we're talking about one that uses cutting-edge battery technology to get you safely and quickly to your destination. There's been much hoopla about GM's new Volt plug-in hybrid, and one of their potential battery suppliers are the folks at A123Systems. The offshoot of work by the acclaimed Professor Yet-Ming Chiang of MIT, A123Systems uses nanoparticles to improve the safety of their batteries and to help prevent "Dell incidents" that were caused by faulty battery cells manufactured by Sony. Along the way, the batteries lose a bit of capacity, but they also vastly improve higher recharge life cycles and higher safe drain rates. In other words, they batteries will last for years, and also can give you the power you need without blowing you up.

While these cells have been utilized in DeWalt's highest-end cordless tools, as far as we know, this is the first mass-produced application of these batteries in a vehicle.

Our specimen arrived in a large rectangular cardboard box with a recycled paper inner tray that holds the scooter itself. There's no assembly to speak of: fold the vertical steering shaft up and insert the handlebars. Flip the power switch and pull dat trigger-style throttle, fool!

At that point, nothing happens. The 2000XR requires that you first kick-start the scooter to a low speed before the electronics will allow the motors to propel you. Roth reps note that this is a safety feature, as well as a convenient way to improve range. While this seems reasonable, it does eliminate the possibility of use by handicapped or injured customers. Calves super sore from too much time shooting hoops? Not for you. Some days, you just want to hit the throttle and have something do the work for you.

Once you get going, the 2000XR does its work quietly and with good power. It's not completely silent like the late Tidalforce bikes, but it's not obnoxiously loud as with some other electric scooters. On smoother surfaces, such as recently paved roads, this board is truly excellent. You can kick with your foot to propel it, and it feels much like a normal kick scooter (perhaps one with a slightly-dragging brake or worn bearing). Squeeze (don't pull) the trigger, and it takes off to a very reasonable speed. Spec junkies may note the top speed of 15 MPH, but it seems appropriate given the small wheels.

On rough pavement, the 2000XR is a bit of a mixed bag. The first day of testing, testers reported that the steering seemed a bit squirrely and odd; perhaps that had something to do with how the steering arms are located behind the front axle. Either way, those complaints evaporated the second day of riding. It seems reasonable to expect a bit of adjustment since most first-time bicycle riders are also probably a bit uncomfortable.

The front suspension seemed effective; we've never tested older Roth Motors/Go Sportinggoods scooters, but we assume the dense rubber foam padding under the deck helps, as well.

Coming Soon: Raw Review Part 2: Commuting, genius details, photo gallery and the innards of the beast

Check out the official site here: http://www.rothmotors.com

"High-performance vehicles such as this may actually be legislated out of existence," Tadge Juechter, GM engineer, bemoans.

"Highly habitable planets such as this may actually be destroyed out of human stupidity," RawEco writers note.

If the regular 400 HP Corvette is truly not fast enough for you, here's a crazy idea: keep making your gas guzzling ZR-1 Corvettes and stop selling Hummer H2 SUVs, Suburbans and Tahoes. Oh, right, you're only saying this to put a dramatic spin on CAFE regulations that GM opposes (big surprise, from the people who also brought you the death of LA's Red Car mass transit system and the EV1. We're waiting to see if/how they deliver the Volt.) Keep in mind this is total BS. We're not opposed to having 4-wheeled fun, but idiotic statements like Tadge's really seem myopic and represent GM poorly.

Mourn the loss of $100,000 gas guzzlers here: http://www.kansascity.com/382/story/411332.html

Send GM and Tadge your love here:

General Motors Corporation
P.O. Box 33170
Detroit, MI 48232-5170

Right on cue, as they shill their so-called "hybrid" Porsche from the previous centuries, Porsche goons have descended on Capitol Hill to petition a change in CAFE standard calculation rules to allow it to avoid being regulated by the standard.

Shame on you. Dr. Porsche is rolling over in his grave.

Here's an interessting tidbit: Porsche is claiming that their very own Dr. Ferdinand Porsche invented a line of "green" cars known as Lohner-Porsches.

Today, Porsche offers a full line of... um... gas guzzlers. Unfortunately for the planet, he apparently didn't pursue the idea very far.

BusinessWeek recently published an article "Is GM's Green Tech Better Than Toyota's?"

Here at RawEco, we believe that hybrids are simply a gas saving measure that are really just a stepping stone to a fully fossil-fuel-free transportation system that involves battery/capacitor electric cars and solar or wind-generated electricity. We really aren't partial to Toyota, Honda or GM in terms of their current halfway technology.

However, we are partial to accurate reporting.

The article claims: "The advantage of GM's so-called two-mode system, points out GM's Larry Nitz, who has headed the automaker's venture with the other three companies, is that the engine speed remains constant when the gears of the vehicle are changing. This is extremely important in the performance of a pickup or SUV when it is carrying loads or going uphill. The power is sent to the wheels mechanically through a series of clutches and gears. In a conventional hybrid, such as Toyota's, power is sent to the wheels electrically, which is less effective for bigger vehicles."

This is a very odd statement. First of all, Toyota's Prius/Camry hybrid systems use a CVT transmission along with multiple electic motors/generators. By definition, a CVT can maintain engine RPMs at a constant rate while vehicle speed varies. So the statement "The advantage of GM's so-called two-mode system... is that the engine speed remains constant when the gears of the vehicle are changing" is not only inaccurate, but misrepresenting Toyota's Synergy system.

Furthermore, the second statement "In a conventional hybrid, such as Toyota's, power is sent to the wheels electrically, which is less effective for bigger vehicles" is simply absurd. Perhaps this journalist is not aware of modern locomotives or subway systems. Modern diesel-electric locomotives can best be described as "series hybrids" like GM's upcoming Volt. Here, a massive diesel generator creates electricity which is used to power electric motors. It seems that the electric motors do just fine hauling 12,000,000 pounds of freight. In fact, according to the all-knowing wikipedia: "As is the case with any vehicle powered by an internal combustion engine, diesel locomotives require some type of power transmission system to couple the output of the prime mover to the driving wheels. In the early days of diesel railroad propulsion development, electric, hydraulic and mechanical power transmission systems were all employed with varying degrees of success. Of the three, electric transmission proved to be most practical, and, except for some diesel-hydraulic locomotives manufactured for lower power applications, nearly all modern Diesel-powered locomotives are diesel-electric."

Similarly, subway systems are pure-electric drive, and, last we checked, can easily haul more than a gas guzzling BMW or GM Suburban.