[综合讨论]【咸鱼字幕组】欧亚马FBI RR3评论 [复制链接]

Review for Oyama FBI RR3

I wanted to try a folder in the 451 wheel size, and also I wanted to try a sideways-folder rather
than the underneath folding Bike Friday's I am used to. Apparently, 451mm is a really common size
in the far east, and I ordered the Oyama RR3.

The machine is Dahon-like, with a big sideways fold in the middle, and a sideways folding stem.
It weighs about 10kg. Brifters, derailleurs are Shimano 105, crankset was advertised as Shimano 105,
but it arrived with a generic-looking "Ounce" crankset.

The big observation first: this bike is not suitable for anyone over about maybe 165 cm tall. The reason
is there is not enough seat height for leg extension. Like all folders, this bike relies on a very long seatpost,
and this one has only about 420 mm, which isn't much. By the way, the seatpost on this bike is an oddball
30.2 mm, while the seat tube is about 30.5 mm, so the fit is pretty sloppy. This is a particularly bad thing
for a folder, because so much is asked of the seat tube for such a bike. In the interests of stiffness, a large
diameter is useful here, which is no doubt why the Dahons have 35mm. But the problem with the Oyama's
seatpost isn't the diameter, it's the length, there just isn't enough of it. And... one other important detail,
the seat tube of the RR3 is not offset with respect to the bottom bracket, unlike most other folders. This
means the seatpost cannot be retracted by telescoping down past the bottom bracket. So, even if you
had a long enough seatpost, you would not be able to do anything with it after folding, except maybe
extract it altogether and keep it with the bike. 30.9 mm is a common diameter for seatposts of course, but
alas, the RR3's is not that size. Sigh. Oyama knows how to build frames where the seat tube is offset such
that long seatposts can be retracted straight through, but for whatever reason, this was not done on the
RR3.

The other big design challenge with folders is how to connect the handlebars to the front wheel. The RR3,
showing its roots, uses the folding mast trick, so the long steerer tube and handlebar fold down alongside
the bike. Basically, for a bike of this kind, this doesn't work. The reason is, this is sold as a performance
roadbike, and as such it does not use, quite properly, a straight mountain-bike style bar, but instead goes
here for the bullhorn design. The folding mast really requires just a straight bar because if there is any
more to it, the bar just sticks out and there's nowhere to put it. You would really need to disassemble the
stem/handlebar, or at least loosen and rearrange things after a fold to have anything like a compact package.
As far as I can see, this is a fundamental problem with any bike that uses the folding mast design with
any handlebar except a straight one. Bike Fridays just put the long stempiece on a socket which is simply
extracted and stowed with the bike. This is by far the better system for handlebars of the type that road
machines tend to have.

Aside from the problem of stowing the handlebar, the basic sideways fold of the RR3 does not produce a very
compact package. The design folds wheel-to-wheel, axle-to-axle, which is in some sense appealing, but
there is a downside: this is the widest part of the undercarriage, and folding this way does not produce
much density. Fold density is made worse by the magnetic skewers the bike has which are intended to
make the folded bike more convenient. The magnets stick out, and this affects the fold. Remove the front
wheel to try to get a more compact package, and you run into the rear magnet on its extended skewer gizmo
and if you rotate the fork to get around that, you run afoul of the hinged handlebar thing. Argh.

This is sold as a performance bike, and the tires are narrow and have yellow sidewalls and look very sharp.
(I am a big salesman for high-visibility components, as about everyone who's ever been seriously hit is.)
Unfortunately, the after tire on this machine blew up soon after its initial inflation to the specs printed on
the sidewall. The plies in that section of the sidewall were not well attached to the bead and the tire let
go with a bang. The sidewall bears the name CST Dual2. The tires _look_ nice anyway. Personally, I'd
rather go with a slightly wider tire on these 451 rims -- one made by a builder with an established
reputation. By the way, the inner tubes for the front and rear tires were different. One barely had
enough valve stem to clear the rim. The valves are Schraeder, another unusual thing for a bicycle with
upmarket pretenses.

The bike is sold with very intriguing Wellgo detachable road-style cleats, again underscoring where this
bicycle is intended to be sold. The pedals are plain cool, but detachable pedals don't salvage a pretty
unimpressive fold.

I can't recommend this bicycle. The seat tube design is plain lousy. The seatpost the bike comes with is
basically a standard mountain bike type, cheaply available no doubt, but it's just too short.
The folding mast handlebar stem also doesn't work for its intended role. And the generic brand crankset may
be ok, but this is not an economy bike. The really annoying part is, the RR3 is sold as as top of the line;
some of Oyama's lesser bikes at least don't have the offset seattube problem. This bike is not cheap enough
to be an economy folder and it's totally deficient in the upmarket. No sale.