I'm working on an old 1997 Kona hahanna and the bottom bracket looks like this, I'm having a bit of trouble finding a replacement with all the different kinds and the markings on this one are damaged.
Could anyone be so kind as to identify this BB and a replacement?
by Statik_shock
3 Comments
English/BSA threaded, 68mm shell, JIS taper. I can’t make out how wide the spindle is, but that could also be measured. (my gut says 113, but I would trusty a ruler over my guy)
The threading is BSA, aka British, aka ISO, aka English, 1.370″ X 24 [tp](https://www.sheldonbrown.com/gloss_tp-z.html#tpi)i threading.
There appears to be a number 68 under the grime. The two shell width options for this type of bottom bracket are 68 mm and 73 mm. If you can not read the markings on the bottom bracket, measure the frame. Take a metric ruler or a caliper and measure the bottom bracket shell width.
[https://www.wikihow.com/Measure-a-Bottom-Bracket](https://www.wikihow.com/Measure-a-Bottom-Bracket)
The other number is the spindle length. You would need to measure that with a caliper. If you are keeping the crankset, it needs to be a pretty close match (within a mm or two) to maintain a good chainline. I would guess it’s about 113 mm.
If the crankset is a Shimano, you can type in the Shimano model number (something like FC-M291) here [https://si.shimano.com/en/](https://si.shimano.com/en/) to get a [dealer manual](https://si.shimano.com/en/pdfs/si/F310D/SI-F310D-000-00-ENG.pdf) that might tell you the spindle length.
If you are changing the crankset, the crank manufacturer will recommend a spindle length.
You can walk into your local bike shop with part in hand and ask for a replacement. It’s a pretty run of the mill standard square taper bottom bracket. Other comments have given you the size info. You can order from several online places, but supporting local small businesses is my preferred way with things like this. Good luck