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Starting from scratch with a new (old) frame and cranks, how much clearance would you leave between the chainring and chainstay if there's no manufacturer to ask?
Fitted a triple (24-34-44) and there's a good 5mm at the closest, so I could go one narrower at least, but I guess the frame might be designed to accommodate a road double (or a 28-38-48 triple).
2nd question, is a 110mm BB 3mm in from a 113, or 1.5mm on each side. If I've got the wrong one will it be throwing my pedals off center, or are the BB's always central in the frame?
Depends on what width chain you're running- wider 8 speed chains could get stuck if you drop your chain. 7mm should cover all bases. Some frames I've owned in the past have only had 4mm clearance. Shimano actually recommend 10mm in the Frame Requirements book.
Bbs normally centred in the frame although I have a posh phil woods one that allows 5mm adjustment.
113mm is 1.5mm on each side wider than 110 mm.
I think they measure from the drive side cup. Do you know the correct chainline of the drive train/crankset you're using? sticking spacers on the drive side would effect this.
Cheers, 10mm sounds like a lot, my singlespeed has about this much >< , the chainring sits in the hollow bit of the chainstay!
I think they measure from the drive side cup.
I don't think that's right, I ordered whatever it was based on it being the same as the fixie which is on it's way out so it wouldn't be wasted if it was wrong, and I measured that from the ends of the spindle.
No idea what was specified originally, frame is old enough that it probably had cotters rather than tapers!
10mm is a little OTT for sure. My three bikes have between 5 and 6.
Single speed narrow Q setups don't matter as you're not likely to suffer from a dropped chain.