Shimano Tiagra Question

kr1s Posts: 125
edited February 2009 in Workshop
My winter bike runs a Tiagra 52/39 double.

I live in the pennines and fancy a 34 compact inner ring.

Would I just be able to do a straight swap :?:
Trek Madone 5.2 08
Specialized Tricross
Scott Scale
Twitter @ChrisBedford1


  • There may be an issue with the front mech but otherwise I would think things should be OK. If I'm wrong (which I may be) I'm sure someone will put me right.
    Tail end Charlie

    The above post may contain traces of sarcasm or/and bullsh*t.
  • maddog 2
    maddog 2 Posts: 8,114
    to the back Frank...

    smallest ring on a standard Shimano double is 38

    if you want a 34 you need a compact chainset (110mm bolt circle diameter, or BCD)
    Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer