I.D BB dimensions help

apple eater
apple eater Posts: 302
edited April 2014 in MTB workshop & tech
Just found out my BB has worn and i now need an urgent replacement. The bike is a trek excaliber 7 29er, 2014 model.

The markings on the original bb are 124.5mm end to end (square taper)
31mm cartridge diameter
21mm shaft diameter

bb 7420
bc 1.37 x 24t

L - 7.3 - R

Any guidance appreciated
I don't know enough to make smart r's remarks about peoples choice of parts 'n' things, yet!

Comments

  • nicklouse
    nicklouse Posts: 50,673
    So any standard 73mm bb with have 124.5mm axle.

    Nothing out of the ordinary.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • apple eater
    apple eater Posts: 302
    Thanks for that, i've been reading all sorts of stuff and seeing things likebritish thread and italian thread and frying my own mind with what ifs!

    Think i'll go for a shimano un 55 in 122mm length if i can't get hold of a 124.5mm bb tomorrow.
    I don't know enough to make smart r's remarks about peoples choice of parts 'n' things, yet!
  • montyburns56b
    montyburns56b Posts: 11
    The bb 7420 suggests that it's a RPM 7420 BB which is only 122.5 mm anyway.
  • apple eater
    apple eater Posts: 302
    all sorted and the drama is now over.
    I don't know enough to make smart r's remarks about peoples choice of parts 'n' things, yet!

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