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Simply can't ride bikes so the only solution is to build bikes.
If the bottom bracket shell measures 73mm that means it takes a 73mm bottom bracket right? Bike man seemed skeptical and sold me a 68mm but I'm pretty sure I'm reading the callipers directly. My first time installing a BB so am obviously terrified I'll screw it, destroy the frame etc.
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To provide some closure to this question, I randomly found https://www.ebay.co.uk/itm/Talon-TCR107-42T-94BCD-Black-Chain-Ring/153685666422?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Which are 5 bolt 94bcd and cheap.
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https://www.sigmasports.com/item/Wolf-Tooth-Components/94-BCD-5-Bolt-Chainring/IC54
Alternatively I could ball out on this, which is pricey, but probably not much more than buying new cranks. Though I'll only have an 8 speed cassette in the back, so it feels a bit obscene to spend more than I've spent on my derailer, shifter, cassette and cranks combined on a blingy chainring.
I will measure the BB shell to get some more solid data.
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Work continues on my gt tequesta. Wired up the front brake and put on the tyres I had sitting in my shed. Had a good go on the rear brake but got confused by the rear cable routing. The rest guide doesn't seem big enough for a cable end grommet thing and there's this weird pipe on the seat tube. I guess it was all designed for cantis not vs.
Need a new cable but once I get one I'll just ignore the seat post guide and route straight to the left, bodge a cable end in somehow.