Chinese Carbon Road Bikes > Cyclocross Frames, Wheels & Components
BSA bottom bracket backwards?
bangacan:
I got a new gravel frame from TanTan cycling. Beautiful frame but having issues with the bottom bracket. I fear they glued the threaded inserts in backwards. Instead of tightening towards the rear of the frame they tighten towards the front. I saw this same issue somewhere on a different forum and the person was told to use green loctate on the bb threads. I don't understand the physics involved with why the bb could/would looses but I am very disappointed as I got a BSA frame because I was nervous about a pressed in BB in a Chinese frame.
Another oddity is that my TRP BB says to use two spacers drive side and one non-drive in a 68mm shell. My digital caliper measures 68mm. When I used the 3 spacers the crank bottomed out against the bb and wouldn't turn. I had to use 1 spacer drive side and none non-drive, as if it was a 73mm shell. Easton ea70 cinch crank.
thoughts?
sync1:
Your BB instructions are for MTB splindles.
Cant find you crank specs but I assume it have a road spindle (shorter than mtb). So, you should use 1 spacer.
bangacan:
https://cdn.shopify.com/s/files/1/0840/7783/8623/files/Bottom_Bracket_Installation_-_BSA.pdf?v=1705436718
What you say makes sense as far as how I had to do it but my caliper read 68mm.
I'm wondering if there is any reason why I can't take the left bb cups and put them on the right side? Same for right side cup. If the threaded inserts are indeed on the wrong side then the threading should work. no?
frnchy:
--- Quote from: bangacan on April 30, 2024, 04:48:17 PM ---I'm wondering if there is any reason why I can't take the left bb cups and put them on the right side? Same for right side cup. If the threaded inserts are indeed on the wrong side then the threading should work. no?
--- End quote ---
Should work as long as you're using a crankset standard with identical bearing sizes left and right- it's basically like taking the bottom bracket assembly as a whole and rotating it 180 degrees. But I would sooner raise a warranty claim - if QC didn't catch such an egregious error, what else might they have missed?
maui400:
Maybe this might interest you too - just as a side note: https://www.bikeradar.com/features/what-is-the-difference-between-an-italian-and-bsa-bottom-bracket
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