Thom Posted November 12, 2005 Report Share Posted November 12, 2005 I've recently bought a 8 speed cassette with a ratio of 12-25 - 12.13.15.17.19.21.23.25. Later on down the track I'm thinking of buying some echo cranks and using 18T up front and 15T at the back. Spindle length on my bb is only 118 so will using the 15T on the cassette throw my chainline off? any help would be great thanks! Quote Link to comment Share on other sites More sharing options...
Martin Posted November 12, 2005 Report Share Posted November 12, 2005 not sure but you may be able to straighten the chain line up with the new echo BB, really not sure though, ask tarty bikes, they have a great advice service. (Y) Quote Link to comment Share on other sites More sharing options...
Thom Posted November 13, 2005 Author Report Share Posted November 13, 2005 are the new echo bb only for the CNCed cranks or can they work with the forged ones as well ? Quote Link to comment Share on other sites More sharing options...
mat hudson Posted November 13, 2005 Report Share Posted November 13, 2005 if i remeber rightley, mark just tightened the shit out of his cranks to splay them a bit, they went on further, the chainline was good :P Quote Link to comment Share on other sites More sharing options...
Mark W Posted November 13, 2005 Report Share Posted November 13, 2005 You can't tighten the shit out of ISIS though :P They just tighten, then stop. With square taper you can do it to some extent if the cranks are shit, but again, it's not ideal... The new Echo BB is nothing new at all, really. It won't alter your chainline more than buying any other (cheaper, e.g. FSA, Truvativ) 128mm BB will. It can be used with any ISIS cranks. You can also break the mech up and move the sprockets around a little, so you can achieve better chainline. However, if you're JUST going to use 18:15, you could whip the cassette off and use a singlespeed kit in conjunction with a 15t sprocket, e.g. Shimano DX, Gusset, Chris King, etc. Quote Link to comment Share on other sites More sharing options...
Thom Posted November 13, 2005 Author Report Share Posted November 13, 2005 (edited) well essentially right now I only use two gears, trials gear = 22-18 and travelling gear = 22-13. If I use 18T, my travelling gear will be 18/13= 1.38 which compared to what I use now 22/13= 1.69 is too easy a gear to be a travelling gear. I would love to have 22T at the front or even 20T but cranks that allow that are kinda expensive like middleburns, bonz etc. So if I use 18T there really is no point in having a travelling gear that is only slightly harder. I guess what I'm trying to say is, should I go singlespeed and ditch the travelling gear or should I use a cassette and have a travelling gear ? Or are there any cranks out there that can take a 22T and aren't that expensive ? Edited November 13, 2005 by norco_trials Quote Link to comment Share on other sites More sharing options...
Porkster Posted November 13, 2005 Report Share Posted November 13, 2005 Like it was stated earlier, if you are going to just run an 18 up front and a 15 in the back, you could use a series of cassette spacers on the hub in different combinations with a single 15T cog ( like a surly 15 T cog, but at least make sure it has a wide base on the cog so it doesnt dig into your cassette as badly) http://www.webcyclery.com/pages.php?pageid=7 that is a link to webcyclery with a page on how to run single speed on a cassette hub. enjoy :P Quote Link to comment Share on other sites More sharing options...
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