Sampaj Posted April 1 Share Looking for an engineer and cyclist that can increase the inner diameter of the stem hole to be able to fit around my fork tube which is slightly larger. make sense? Happy to share pics and measurements if someone can help - pay of course Link to comment Share on other sites More sharing options...
guidodg Posted April 1 Share just reduce the diameter of the steerer on a lathe... Link to comment Share on other sites More sharing options...
LazyTrailRider Posted April 1 Share …or just buy a new stem. They’re one of the cheapest components generally speaking, any engineering time spent is likely to vastly outweigh the cost of just getting a new one. Link to comment Share on other sites More sharing options...
lechatnoir Posted April 1 Share are you sure it's not just an OD2 stem you need? Check with Giant - that's their thing. Machining a stem or steerer will remove material that might actually be needed for strength. Link to comment Share on other sites More sharing options...
guidodg Posted April 1 Share sorry but it is the 1st April... splat 1 Link to comment Share on other sites More sharing options...
Sampaj Posted April 1 Share Thanks guys forgot it was 1 April. its a Cinelli altar stem and I’d love to use it on this bike not sure pic helps Link to comment Share on other sites More sharing options...
guidodg Posted April 1 Share I would not attempt it for safety's sake...would you honestly trust a reamed out stem not to fail while riding?? Link to comment Share on other sites More sharing options...
Sampaj Posted April 1 Share 39 minutes ago, guidodg said: I would not attempt it for safety's sake...would you honestly trust a reamed out stem not to fail while riding?? You’re right ill have to do something more realistic- like buy a bike that the stem will fit on. thank you Link to comment Share on other sites More sharing options...
tinmug Posted April 1 Share 12 minutes ago, Sampaj said: You’re right ill have to do something more realistic- like buy a bike that the stem will fit on. thank you Just marry the * stem. Might be cheaper. Link to comment Share on other sites More sharing options...
letsride Posted April 1 Share So, looks like the alter you have is 1 1/8th and the steerer is 1” At the time, 20+ years ago, a lot of the ahead stems came with an adaptor shim in the box. Might still have one or two floating around. @Sampaj what is the height of the alter stem where it clamps around the steerer tube? Link to comment Share on other sites More sharing options...
Sampaj Posted April 1 Share 1 hour ago, letsride said: So, looks like the alter you have is 1 1/8th and the steerer is 1” At the time, 20+ years ago, a lot of the ahead stems came with an adaptor shim in the box. Might still have one or two floating around. @Sampaj what is the height of the alter stem where it clamps around the steerer tube? Thanks @letsride does this help https://www.bricklanebikes.co.uk/cinelli-alter-stem-3 Link to comment Share on other sites More sharing options...
Graham W Posted April 1 Share You just need a reducer bush 100Tours 1 Link to comment Share on other sites More sharing options...
Chadvdw67 Posted April 2 Share The stems hole is smaller than the steerer tube diameter, how on earth is a bush going to solve this guys problem? BuffsVintageBikes 1 Link to comment Share on other sites More sharing options...
guidodg Posted April 2 Share 12 hours ago, letsride said: So, looks like the alter you have is 1 1/8th and the steerer is 1” At the time, 20+ years ago, a lot of the ahead stems came with an adaptor shim in the box. Might still have one or two floating around. @Sampaj what is the height of the alter stem where it clamps around the steerer tube? looks to me like the steerer is bigger than the hole in the stem Link to comment Share on other sites More sharing options...
letsride Posted April 2 Share Apologies, you are both quite right. No way to do this safely @Sampaj. These stems were made in both 1 and 1 1/8th, best bet would be to do a swap. Link to comment Share on other sites More sharing options...
Sampaj Posted April 2 Share Thank you everyone for the informed information- much appreciated Link to comment Share on other sites More sharing options...
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