Retro mountain bikes

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Jonny69

Can anyone tell me about old mtb quill stem standards? This one is a 28.6mm (1-1/8”) quill with 31.8mm bars. What is that, a 1-1/4” steerer tube?

I’m looking for a round replacement or a 1-1/8” to 1-1/8” quill adapter to use an Ahead stem. Does that even exist?

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Egghead in reply to @Jonny69

https://www.sheldonbrown.com/cribsheet-headsets.html

If the stem/quill is 28.6mm (1-1/8"), then the steerer inner diameter will be the same and the steerer outer diameter will be, as you say 1-1/4" or 31.8mm.

I imagine a straight adapter is available, just the usual is 1" to 1-1/8".

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Jonny69 in reply to @Egghead

I imagine a straight adapter is available, just the usual is 1" to 1-1/8"

There seems to be a Nitto straight adapter but I can’t find one in the UK so it’s about £40 landed! I think I’ve got a plan up my sleeve though - keep an eye on the hacks and bodges thread.

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