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Old 01-25-18, 09:41 AM   #26
invisiblehand
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I read that after two years, you now need to replace the rim. Over what distance is that? As you're almost certainly aware, the smaller rim will wear out faster. Based solely on geometry -- 622/349 -- not quite twice as fast. If you're using the bike regularly for commutes and travel in all sorts of weather, replacing a rim every four years on regular sized bikes is on the quick side but not unheard of.

With respect to braking power, I always found Bromptons a bit lacking even after they came out with the dual pivot brakes. Although it was never clear to me whether it was more of a function of geometry and the relatively upright posture or the brakes/frame-flexing/housing. I'm not sure it's convenient for you to try out disk brakes on the Brompton first, but if it's an expensive conversion or has other negative side effects on say the fold, it might be worthwhile to test.

As for wheel building, I'd avoid a 36-hole 349 wheel. That's a lot of spokes in a small area. I imagine pumping air into tubes would be inconvenient and, if you have spokes crossing, you won't have a lot of room to fiddle around. Mind you, using a tension-meter will already be tricky with such short spokes -- it's probably impossible with the standard Park Tool tension meter ... even with a small flange hub -- and wheel building a small wheel when everyone's experience is with 26" and up wheels will take some additional patience.
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Old 01-25-18, 09:48 AM   #27
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Quote:
Originally Posted by Winfried View Post
This thread is not about tires, but about getting a better front brake.
Ive found their recent double pivot, with stock Fibrax pads, fine.. but I changed the inserts to Kool Stop Salmon compound, any how..


put KS Continental in the CLB single pivots , on the Mk2.. that took some creativity..


Brompton uses 28 hole rims, Mk2 front was 20 spoke, bike friday Tikit and I presume Pakit, use 24 spoke , and can lace to 36 hole IGH, etc.






Last edited by fietsbob; 01-25-18 at 09:53 AM.
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Old 01-28-18, 09:39 AM   #28
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Originally Posted by rhenning View Post
From the picture it looks doable. I would talk to a wheel builder and get his or her opinion. I have one of those hubs and with a 16 inch rim the spokes are going to be very short. Probably as short as a rear hub using an IGH.
Thanks.

It's been done by Greenspeed, and there are some e-bike kits such as Sparticle's for Brompton that use a front wheel motor:



Considering a drum brake is not heavier than a motor, I assume the spokes will be ok. I'm more concerned about the force from the retention arm against the fork.

--
Edit: It looks like 70mm is the width of the drum brake vertically, while the internal distance between the drop-outs (OLD) is 100mm :-/

What Greenspeed seems to have done, is 1) cutting the axis so it fits the 74mm Brompton fork, and 2) drilled holes in the hub for the spokes:

Last edited by Winfried; 01-28-18 at 10:14 AM.
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