31.8mm (Steerer tube) Stem Riser
03-18-24, 04:17 PM
#26
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The "31.8" advertised on most stems is the handlebar clamp diameter. Even if the pictured stems do have a 31.8mm steer tube diameter, they move the bars up and away which is the problem.
I have a new fork on order, It should be here Wednesday and that should work fine.
03-19-24, 09:46 PM
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Fork arrived from Santana today. Now for a quick coat of paint! A 1-1/8 steerer tube slides nicely inside the fork’s 1-1/4 steerer tune, so I can get away from the lack of stem options.
03-22-24, 09:19 AM
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Depending on how it fits, I may insert a 1-1/8” tube into the fork which will allow me more adjustment and also get me out of the 1-1/4 stem nightmare.
Last edited by PromptCritical; 03-23-24 at 09:10 PM.
03-23-24, 09:10 PM
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It’s a new fork so the star nut isn’t installed. I’ll use a 1-1/8” star nut in the new tube or drive the 1-1/4” star nut deep enough not to interfere with the new tube.
03-24-24, 07:19 AM
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You may want to talk to a frame builder about the logistics here, keeping in mind that you’ll probably want it brazed, will need access to the star nut for headset adjustment, and a cross bolt would interfere with headset/spacers. This is not a part of the bike you want kludged together, especially on a tandem. It might make more sense to track down the 31-8 - 28.6 adapter referenced above. I probably would’ve gone the 28.6 + headtube reducers route to keep it simple.
