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Did you find a solution @WadaWada ?
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Finished the sweet fixie.
I found out it was 1 of 80 frames made for a cycling club and used as rental bikes, this one is from 2008.
The frame doesn't have much 'chainring clearance' and the 46t ring was nearly toughing the chainstay. I use a Shimano ht2 BB on this and solved this by using a MTB BB of which the cups are 1mm narrower and using one spacer on the ds. -
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Even same brand tyres won't necessarily be the same size
Very true I already experienced this with Conti mtb tyres and Schwalbe road tyres. Also Conti gp4000 was wider than the newer gp5000 (in the same sizes).
Best thing to do if you want to be sure is trying to find someone with exactly the tyres you're after and ask and also ask their rim width -
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Lol!