trials owns Posted April 30, 2011 Report Share Posted April 30, 2011 (edited) Yo all, Thinking about buying my mates single speed dirt jumper but the bottom bracket has had it. Dont have a clue what bottom brakets go in so, can someone post a link of a typical cheap one and how you install them? so are they just bmx bottom bracket? are they all compatiable? somthing like this? http://www.chainreactioncycles.com/Models.aspx?PartnerID=79&ModelID=42930 cheers! Edited April 30, 2011 by trials owns Quote Link to comment Share on other sites More sharing options...
RobinJI Posted April 30, 2011 Report Share Posted April 30, 2011 Completely depends on the frame and cranks. Dirt jump bikes use pretty much every type of bottom bracket going.By which I mean, let us know the frame and cranks and I/someone should be able to help out. Quote Link to comment Share on other sites More sharing options...
trials owns Posted April 30, 2011 Author Report Share Posted April 30, 2011 Completely depends on the frame and cranks. Dirt jump bikes use pretty much every type of bottom bracket going. aahh hahahahah Thats a pain, I though there would be a set type like trials. cheers. Quote Link to comment Share on other sites More sharing options...
Revolver Posted April 30, 2011 Report Share Posted April 30, 2011 Does the BB screw in? It's the same as a MTB. Does it push in? It's one of a few BMX types. Quote Link to comment Share on other sites More sharing options...
trials owns Posted April 30, 2011 Author Report Share Posted April 30, 2011 Does the BB screw in? It's the same as a MTB. Does it push in? It's one of a few BMX types. sweet piece of advice i will have a look at the bike when im up his way! Quote Link to comment Share on other sites More sharing options...
RobinJI Posted April 30, 2011 Report Share Posted April 30, 2011 To add to that: If it screws in, then it could be internal or external, if it's internal it could be: A 3 piece/BMX style euro BB, will have a lock ring on the non-drive side, and the axle will be floating/able to be removed without any more dismantling, with these you can usually replace just the bearings. these generally come in 19 or 22mm axle sizes depending on the make of cranks. A quare taper cartridge bb, same thing they use on cheep/old trials bikes. ISIS bb, same thing as on modern trials bikes. Powerspline, kind of like ISIS, but truvative's own system, half way between ISIS and square taper quality wise. Octalink, seriously unlikely on a dirt jump bike, shimano's own take on a splined BB. If it's external it could be: Hollowtech 2 or similar, 2 external cups and an axle fixed to one of the crank arms that slides out of the BB, shimano/truvative/raceface/FSA all have their own take on it, most are cross compatible. Truvative Howitser, look similar to hollowtech 2 external ones, but the axle's fixed in place as part of the BB not the cranks. If it presses in it could be spanish or US, Spanish looks like a euro/screw in one from the outside, but is press in, while US uses a noticeably bigger shell. Like most BMX style set-ups these typically use either a 19mm or 22mm axle, and you can normally replace just the bearings for pretty sensible money. Quote Link to comment Share on other sites More sharing options...
Tomm Posted April 30, 2011 Report Share Posted April 30, 2011 Just get 2 pictures. One from the right side of the bike so we can see what cranks it has, and one from the other side so we can see the size/ shape of the BB. EDIT: The only other thing you would need to know would possibly be the width of the frame at the BB. It'll be either 68mm or 73mm Quote Link to comment Share on other sites More sharing options...
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