Change in Chainset = knee pain?

manxshred
manxshred Posts: 295
edited May 2012 in Training, fitness and health
On Sunday I went for a long ride (70miles) and about 15 miles from home I started to get pain in my right knee on the inside of my leg running down next to my knee cap. It wasn't much fun heading home with a hilly route ahead and rain and sleet.

I recently changed by chainset from a Rotor 3D compact 172.5mm to a SRAM Force compact 172.5mm.

Before this change, I moved my cleat on my right foot as the ball of my foot was getting very sore so moved it back a few mm as it was too far forward which cured that pain.

Could the Q factor have changed slightly? My cleats are setup with no float (as per fitting with Cadence sport) so that is why I was thinking of the Q factor.
Thanks

Comments

  • Tom Dean
    Tom Dean Posts: 1,723
    Have you tried measuring or looking up the q factors of your chainsets?
  • manxshred
    manxshred Posts: 295
    Well, Rotor list theirs as 147mm, while I have seen everything from 145.2 to 150 for the SRAM, so to me the difference is so small that it probably isn't causing it. But I am trying to understand why I suddenly have knee pain when I have never had pain there before.
  • JimboPlob
    JimboPlob Posts: 397
    I think the sram's have a wider q-factor. I meausred my durace ace v sram red BB30. Didnt get a fully accurate measurement, but repeated it several times on both, and each time SRAM q-factor was wider than the dura ace. Its only about 5mm or so, but my body can tell the difference. I have moved my cleats towards outside of shoe by 3mm.

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