Currently, I'm little bit worried about the compatibility of my crankset and the bottom bracket. The crankset is Truvativ Isoflow, the BB is BB-UN55 (Square taper). Yesterday, after the bike hit +1400 km mark, I scheduled maintenance for the crankset. I disassemble the crank arms and the BB, cleaned them, apply grease (I use Phill Wood), and reassemble.
However, when I removed the crank arms, I didn't need a crank puller at all. This made me worried that the crank arms might be loose. So what I might want is tigthen the crank bolts. However, on the drive side, the right crank arm already hit "the limit" (see an image below) so it wouldn't go any further in.
To the best of my knowledge and according to this specification document, the BB should be compatible with the crankset. Its spindle width is 113mm to achieve 48.5mm chainline (The bike is a single speed), see a table on the bottomleft of the pdf document.
Another solution I found on the web is not applying grease on the spindle and the crankarm holes to increase friction. This is what I did. So think the crankarms are tighter right now. So far I have no problem, no creaking noise, and I doubt the crank arms will be fall off anytime soon. However, I'm not sure whether I'll have problems in the future.
I put some more information:
- according to the pdf document, the crankset is compatible with truvativ LE square taper BB which has JIS interface. The UN55 also have JIS. So the crankarms and the BB should be compatible, right?
- When I built the bike in April, I was noob so I put too much grease
on the spindle. I think this was the reason why the crankarms fell
off easily. That's why I didn't grease the spindle yesterday.