Does this mean that my taiwanese bike is french threaded????????? I’m about to have a breakdown
New BSA bb is too small to thread on… shell is definitely 68mm across….
byu/LouisMXV inbikewrench
by LouisMXV
Does this mean that my taiwanese bike is french threaded????????? I’m about to have a breakdown
New BSA bb is too small to thread on… shell is definitely 68mm across….
byu/LouisMXV inbikewrench
by LouisMXV
9 Comments
show us the inside of the shell please…
Can you tell from this? Right/drive side, upside down
https://preview.redd.it/47zaevqa0i6h1.jpeg?width=4284&format=pjpg&auto=webp&s=6a8ed2c10f99fca71d431ce0f8f981378185f316
https://preview.redd.it/p2lwuw1e0i6h1.jpeg?width=4284&format=pjpg&auto=webp&s=339eff2da7a26e1c5f7d4481cd58f1ac458f0b80
left side
Well those threads look destroyed. There’s more than one way to fix that. One option that doesn’t require machining is a threadless bottom bracket.
The threads are toast. Cheapest fix would be to get a thread together BB made for a press fit frame and use that since your bike is pretty much a press fit BB now that those threads are gone.
https://preview.redd.it/l6quvve36i6h1.jpeg?width=750&format=pjpg&auto=webp&s=03ac58f41bdbd36b9076281768478f8078eac568
This one. Fits Shimano and Sram
Please always provide a little more context to whatever bike you are working on.
If that bottom bracket you tried to install there, is too large, the most likely explanation would be, the bottom bracket shell is NOT BSA standard (nowadays also referred to as ISO). So probably an ITA one which is larger than BSA/ISO.
As for the threads, yeah not ideal but even if these threads were completely stripped, it would be as easy to insert the BB.
So please check the width of the BB shell, if it is 70mm, it is ITA.
What bike is this on? It looks too old to be a T47 BB, but french and italian are possible.
Looks like you have a “used to be threaded” frame.