Singlespeed & Fixed Gear - How do i find out my BB size?

Do i have to measure it? If so is it end to end or are there some tricks to it? Would it be stamped on the BB shell or the BB itself?

measure it.
depending on what kind of BB it is it might be printed on the cartridge or the spindle itself.

can i just measure the bottom bracket by measuring the bottom bracket outter shell on the very lowest point of the frame?

can i just put a tape measure to the frame where the bottom bracket is?

yes you can. Make sure to start measuring from the 1" mark on your tape because that metal hangover thing on the end can add a couple of mm

are you looking for your shell width (which will likely tell you threading type) or spindle length?

yes you can. Make sure to start measuring from the 1" mark on your tape because that metal hangover thing on the end can add a couple of mm

Um, that's what the metal thing is made for: getting your measurement to accurately start at 0. The metal tab has some play on a decent tape measure because it's meant to have two positions, one "out" so you can put it on the outside of whatever you're measuring and the "in" position when you have to push it up against a surface.

I've always had more success in building things using the +1" method. Ends up being far more consistent, especially if being exact is a significant issue.

Excuse me if you know this already or if it's irrelevant Hanus, but to get a full description of your bb you need to know shell width, spindle width, what type the spindle interface is (jis? octalink? isis?) and the type of threading.

Do i have to measure it? If so is it end to end or are there some tricks to it? Would it be stamped on the BB shell or the BB itself?


What bike do you have? Do you have a serial number? If so, the internet is your friend.


Otherwise, calipers will make quick work of it. Inside diameter measurement.

Excuse me if you know this already or if it's irrelevant Hanus, but to get a full description of your bb you need to know shell width, spindle width, what type the spindle interface is (jis? octalink? isis?) and the type of threading.

you better not get this thread shut down.

what kind of frame do you have?

How do you find out if its Italian, French or English threading?

By the BB width.

yeah, I would say tell us what the frame is, would make it way easier to help.

Fuji Del Rey from the 70's or 80's

im pretty sure there is a serial number on it, i just need to go down stairs and write it down.

99.9999% chance of being British threaded

i have no idea what that means

Start here. (http://sheldonbrown.com/gloss_bo-z.html#bottom)

sometimes even the ruler is not accurate if its one of them cheap 99 cents.

stamped on the frame below the bottom bracket it says FJ118986

its a fuji del rey and i dont think ill be riding it until i fix this, because it sounds like my cranks are about to fall off.

i think i may have fixed it, it was just my rear wheel working itself loose