toyota200x Posted February 23, 2007 Report Share Posted February 23, 2007 I have a 2003 or so echo team mod that I am trying to build up. I have lead on some onza square taper cranks which I want to run FFW on. What size BB do I need in order to do this? I currently have a 118mm square taper BB, is this long enough? Will a 17t up front and a 13t in the rear work?Thank you. Quote Link to comment Share on other sites More sharing options...
Mark W Posted February 23, 2007 Report Share Posted February 23, 2007 Hey,17:13 would be pretty spinny - the usual ratio to run is 18:12, which is the sort of 'optimum' mod gear ratio. As for the BB, you'll almost certainly need a 68x128mm BB (Or a 73x128mm BB, as long as you run the little spacer with it), as anything shorter generally won't work, especially iwth square taper cranks. Just make sure you don't over-tighten the crank bolts as that can stretch the tapers on the cranks, meaning you have to slide them further up the taper to get them to get tight, resulting in less freewheel clearance. Quote Link to comment Share on other sites More sharing options...
toyota200x Posted February 23, 2007 Author Report Share Posted February 23, 2007 So is there such a thing as a square taper 128 BB? What did these Echo teams come with back in 2003 for a BB. I have heard that they possibly came with a 118 or around there. Thanks for the help and keep posting. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted February 23, 2007 Report Share Posted February 23, 2007 You *may* be able to get away with a 118mm since I assume you'll be running no bashring on the cranks?My best advice would be to try your 118 and hunt down longer if you need - 122.5mm and 127.5mm should be pretty widely available Adam Quote Link to comment Share on other sites More sharing options...
toyota200x Posted February 24, 2007 Author Report Share Posted February 24, 2007 Yeah I will not have a bash guard. Thank you Adam. Quote Link to comment Share on other sites More sharing options...
Gavyn. Posted February 26, 2007 Report Share Posted February 26, 2007 73mm is to big if you have a freewheel which the tabs stick out on, they will rub on the bb shell. 68mm * 122mm or 128 should be fine. Quote Link to comment Share on other sites More sharing options...
Mark W Posted February 26, 2007 Report Share Posted February 26, 2007 I don't think it makes a great deal of difference to the drive-side crank, 'cos the majority of BBs come in 73 with the 2.5mm spacer to reduce it to 68mm. As a result, the length of spindle you get on the right-side is the same, it's just the whole unit shifts over 2.5mm. At least, that's what it was like with all the Shimano, FSA and Truvativ BBs I had Quote Link to comment Share on other sites More sharing options...
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