Thread: Widening a hub
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Old 07-22-18 | 10:15 AM
  #12  
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Asi
Engineer
 
Joined: May 2010
Posts: 591
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From: Bucharest, Romania, Europe

Bikes: 1989 Krapf (with Dura-ace) road bike, 1973 Sputnik (made by XB3) road bike , 1961 Peugeot fixed gear, 2010 Trek 4400

Well.. this is a project bike. The road everything conversion. So it's a road frame, road bar (flop and chop), road hubs. The only track/fixie specific is the rear cog, chain and crank (1/8 50t 130BCD)
Because i can't push the chainring (50T can't sit sit closer to the frame.. atm it has about 7mm clearance to chainstay.. i can cut that to 3mm with shorter BB but i think it sits just fine as is), the chainline is set at 46mm instead of normal track at 40-42mm. Beacuse of that, this road hub (that was meant to have a long freewheel on it) is pushed far to the right to achieve this 46mm chainline - this gets the hub shifted so far to the right. I've put the wheel about 5-10mm to the right (it does not sit center in the frame) to gain some lateral strength as if it sat center the nds spokes were too close to vertical which is really not good. Now at 5th axle change i want to put a stop to this.

A fixed gear hub is meant to have 42 or so chainline so even with a new hub i'd have to push it to the right a bit for 46 chainline. The crazy idea a LBS told me is to coldset only the left triangle to get rid of those spacers (but this does not solve the offcenter wheel, or the NDS spoke angle) I said no way. this is a kludge to purposely coldset misaligned frame.

Other ideas would be another hub but with 46mm chainline for fixed gear or single speed but is just a unicorn of a hub. So i plan to make my own.
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