jur

Yep I'll take some at work tomorrow.

jur

feijai

Clearly the bridge is getting cleared. But from that last picture, it looks like it's just *barely* clearing the chainstays. Do you have a better angle showing how much tolerance you have there?

jur

It's 3mm. I think that is quite adequate - you would have to have a bad bulge if it touched. The problem is not the frame - it is the mudguard stays. I had to optimise their length. The brake calipers could also be installed at a better angle - the angle such that the mudguard is pressed closer to the tyre.

Folding-Bikes

Some people cant just stop tinkering..

Love it!

Juan

chagzuki

I wonder how easy it'd be to make one's own stays. . . are mini-bending tools easy to come by?

How does the gearing work out?

bhkyte

If it only just fits then mud might be a problem.

rex615

Raw lacquered Brommies just look so cool.

fietsbob

sure , they're called 'pliers'..

some are round jawed for bending things , like jewelry parts.

jur

You mean with the Schlumpf? I selected the gearing so it has in essence added a lower and a higher gear to the 2 standard gears.

Schlumpf low range = hills & headwind
Schlumpf high range = cruising and downhills.

fietsbob

That the overdrive crank or the reduction gear?
using the Mountain drive to Dual range the BSR/AW3 out here..

jur

It's the Speed Drive.

Folding-Bikes

Why did you take the covers for the speed drive off? is it not uncomfortable to change gears with such a small surface to tap?

Juan

jur

It is a bit fiddly with my cycling sandals, but mine did not come with covers, that's an optional extra. I am planning to get some from Greenspeed.

fietsbob

The other EZ shift piece screws on under the pedal, and is a no-go fit, with the folding pedal.

I dont use the ones that came with my MD, if anyone state-side wants them ..
Post to AU when the distributor there is a walk-in, would be silly..

whats your tooth count on those 3 [2 cog ,1 CR]on that?

jur

back is 13T, 16T, front is 42T. Gears:

44.3"
54.5"
73.1"
90.0"

JoelBikes

Jur - thanks for this. Did you notice any difference in the ride?

jur

Not so much; it could be a little cushier, but since the Brompton has suspension in the back anyway, the effect of a cushier tyre is masked. It would be more forgiving than the Kojak wrt getting pinch flats which was the starting point of a week of trouble with the rear wheel.

I'm not convinced at all it is any major improvement and it is unlikely that I would buy another. The Primo Comet seems better for several reasons - it is narrower so would not pose any fitting problems, it is much more robust than the Kojak and is a fair bit lighter than the Scorcher, and is cheaper than both.

chagzuki

I like my Scorcher on the front. I agree, the Brompton suspension works excellently, there's no need for any extra cushioning at the back. The front, however, is happier with a little extra air.

fietsbob

Looked [web] at some of the folks who built up a wheel around the Pan Tour Hub..
they designed an elastomer between the axle and the hub shell,
their 1/2 inch of travel would take the front buzz out ,
the motion angle is adjustable...
fore and aft keeps the brake pads over the rim ..

feijai

So last week my Scorcher TRs finally wore thin enough that one developed a hole in its sidewall big enough for the tube to herniate out. :-) Time to replace. As I was waiting for new Scorchers to come in, I tried on my old Marathons again, and WOW that was bad.

Anyway: after hearing of Jur's success I gave my remaining usable old Scorcher to a friend with a Brompton, probably 5 years old I'd guess (he bought it used). And the verdict: absolutely no way could it possibly be mounted on the back wheel, because of -- what else -- the chainstay bridge. Either they make magic Bromptons in Australia or Brompton has changed its design recently in that regard.

invisiblehand

Interesting. Thanks for the news.

fietsbob

Kojaks go a bit skinnier and slick, for the need for speed..
in the back, for ride comfort, just change to the softer suspension elastomer.

the excessively tight fit may be Why the sidewall shredded.

jur

I am convinced they modded the design to increase the tyre clearance. It's unlikely that I got one with a one-off incorrectly brazed bridge.

LWaB

My newest B (2 years old) has the bigger chainstay bridge clearance. My old B had mud/grit on the tyre skimming the bridge.