Help bottom bracket
- Thread starter bigkev
- Start date
Bingo! Square ends is the exact bit of information that we need. If it was my bike I'd get a Shimano UN53 bottom bracket for it. At the low end lots of manufacturers cheat by using some pretty low end bottom brackets. The Shimano UN53 is a big step up in durability and is only a few dollars more expensive.bigkev said:
What crankset are you using it with (double/triple)? I have a spare shimano BB-UN71 (105 grade, back in the day) that was pulled off an old road frame that was hardly used, before converting it to a trainer bike. Has boths ide of hte BB shell, and axle bolts too.bigkev said:
Axle length is about 113mm (don't have calipers, so guesstimating from a ruler) - let me know if you're interested.
n
one note shimano is phaseing out square taper... it will get to be hard to get thay kinda stuff soon... stock upRetro Grouch said:
I'd think the UN71 I have matches up in axle length with the one you have.bigkev said:
Any idea on what your BB shell width is? That's probably the only other sticking point - this one is from a road bike with a 68mm english threaded shell. If yours is a little longer (eg. MTB shell of 72mm), then it may not work.
You should replace them pretty much as soon as you start hearing signs of wear, like you're describing. How many kilometres this is depends on a whole lot of things.
If you plan to keep your current bike for a few more years of lots of riding, it may be worth upgrading the whole crankset and BB to something that will be around for a while, like an ISIS setup or (if you have a lot of money to spend on a not so expensive bike) hollowtech. You could also upgrade to octolink, but that is being phased out as well.
n
Japanese spec square taper bottom brackets are one part that I don't anticipate being difficult to find for a long time.IEatRice4Dinner said:
It's the high end stuff that disappears. 27 x 1 1/4 tires, which haven't been spec'ed on new bikes for probably 20 years, are easy to find but you can't get better-than-Sora quality 8-speed STI shifters.
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