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Square taper to Isis

The RookieThe Rookie Posts: 27,747
edited October 2010 in The workshop
My daughter is currently commuting on her Hybrid buiilt Claude Butler trailridge, running a square taper BB with Shimano cheapy (Rivited C/W) CHainset.

She has some tasty Truvative Elita isis cranks and wheels to go on, we've already found her a trouser guard (she commutes to school in Jeans) in place of the larger chain ring, so she'll be using the inner two wheels (42/32 sothe same as the larger and middle of the current triple).

Want to sort her the BB for Christmas (to go with the trouser guard she doesn't know we have), the square taper on there is 113mm, so what width do we need, 113 (assuming distance from end of BB to middle wheel is the same square to ISIS) or something different? I want to keep the middle chain wheel in the same location as the current MTB middle as she only really uses the biggest wheel on her current commute.

Simon

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