I recently bough a fixed gear bike off eBay which is a Ross road bike turned fixed. The problem is that even though the bottom bracket is 68x122 (meaning the longest one I can possibly find), the chainring still comes VERY close to the chainstay. The cranks are Sugino GS. My first thought would be to get a longer bottom bracket but I can't imagine any exist. How should I solve the problem? Thanks.

if they're not rubbing, i wouldn't worry about it.

Don't worry about it. Mine is only about 2mm off, but unless you bend your chainring it's fine.

Big chainring...?
If your chainline is good, don't worry about it...

Either A.) Don't worry about it, or B.) get a smaller chainring.

Ta-da!

You could also put a washer(s) between the crank and the BB before you tighten it on. That'll move it out a bit.

pretty sure he (or she) means between the crank and the chainring, but that would affect your chain line, and sounds like it isn't necessary. as long as the ring isn't rubbing the chainstay, you're fine.

second what everyone else says, but pics of the gap and your chainline?

fsnl
sparky

How can you solve what problem? My chainring is about 1 to 1,5 mm from the chainstay. So what? If it doesn't rub when you stand up and hammer, you're good to go.

I have 1mm between my 48t chainring and chainstay. I worried about it for a couple days, but after climbing some big hills and not having any interference, I don't worry anymore. If the chainline is good and you don't want a bigger chainring, then be happy. If you want to change something, here are a few ideas.

Shimano does make a 127.5mm BB. I have one on my SS MTB conversion. It was neccessary because of the awkward combination of BMX cranks and Surly SS hub.

Do you have your chainring on the inside or outside position on the crank spider? If it's on the inside, you could move it to the outside to fix any issue with chainline or chainstay interference.

If the chainline is good, but this close fit still bugs you, just use a smaller chainring and smaller cog that give the same gear ratio.

Yeah, I wouldn't worry much. If it's a BIG road frame with a larger rear triangle you MIGHT get enough flex if you were torque'n the living hell out of it. Maybe.

if you care that much, wrap a towel around your chainstay and, yes, hammer it

Bottom bracket spacers:

https://www.loosescrews.com/index.cgi...d=623486815278

Thanks for the link, that looks good. And all of you guys are making me feel better about my situation because it can't be less than a 1mm gap which is what a lot of you have said you have.

you can hammer in the stay a lil, after all its a ROSS !

Its not the best solution, but its the easiest. If its a steel frame, just wack the chain stay with the edge of the hammer. It'll give you another couple of mm of clearance and it wont hurt your frame other than just putting a small dent in it.

Please stay away from my bikes. You frighten them.