Egg Fried Rice Posted January 7, 2008 Report Share Posted January 7, 2008 ive been needing a new BB for my new frame and i usually get the UN53 127.5. Popped into my local shop today but they hadn't had any except the UN54's.What actually the difference?I've done some research and apparently the UN53 have been discontinued and the 54 is the replacement but with a hollow axle! I haven't got a 53 with me but is the 53 a hollow axle? if not, then do you think the 54 is okay to use? will i die? i mean its a hollow axle, must mean its got to be slightly weaker?any help would be great.JK Quote Link to comment Share on other sites More sharing options...
basher Posted January 7, 2008 Report Share Posted January 7, 2008 UN53 doesnt use a hollow axel, but thats as much as i can help you Quote Link to comment Share on other sites More sharing options...
Tomm Posted January 7, 2008 Report Share Posted January 7, 2008 Yeah, I think the UN54 is pretty much the only option nowadays - unless you can find an old UN53 or 73. I've heard that the hollow axle is a good thing, since bottom brackets always break at the end of the crank bolt thread, because it's a stress riser. Having a straight-through axle eliminates the stress riser, apparently. Anyway, the theory is that it's just as strong and lighter. I've got one. But I've never broken a BB anyway so can't really comment on strength. Quote Link to comment Share on other sites More sharing options...
balfa Posted January 7, 2008 Report Share Posted January 7, 2008 (edited) Why not get a onza or vp BB instead? No hollow axels with those. Edited January 7, 2008 by balfa Quote Link to comment Share on other sites More sharing options...
Ladd Posted January 7, 2008 Report Share Posted January 7, 2008 UN53 were super bb's smooth aswell and strong.. but the new ones the bearings dont feel that nice but i ran one on my echo for ages never snapped. Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted January 9, 2008 Report Share Posted January 9, 2008 http://chainreactioncycles.com/Models.aspx?ModelID=12^UN53^ Quote Link to comment Share on other sites More sharing options...
Tommy d Posted January 9, 2008 Report Share Posted January 9, 2008 I've been using a UN54 for about 6 months with no trouble so far. I'm not a BB snapper though. Quote Link to comment Share on other sites More sharing options...
Tom_ Posted January 9, 2008 Report Share Posted January 9, 2008 http://chainreactioncycles.com/Models.aspx?ModelID=12^UN53^But its 73mm Most frames are 68mm Quote Link to comment Share on other sites More sharing options...
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