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  1. #1
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    Moving from a SR Suntour crank to a Shimano crank...

    My bike has a SR Suntour crank with what looks like a PF bottom bracket. There is no visible outboard bearings. I want to swap my cranks for Shimano or Sram. Can I change to a threaded BB or do I have to use a PF BB? Thanks

  2. #2
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    Probably the old style cartridge bearing threaded BB. Assuming the SR crank is a cheap one, it's unlikely to have press fit. Look at the crank to BB interface - should be able to tell from that.

  3. #3
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    I agree with Slash5, if it is an SR Suntour crank, it is very unlikley it is a PF BB.
    "Ideal bikes are not bought, they evolve beneath you"

  4. #4
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    Turns out the crank and BB is a square taper type. Since it is threaded, can I remove the current BB and replace it with a Shimano Hollow Tech II external BB and Deore cranks? Thanks!

  5. #5
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    Yes, it should work fine. You'll probably have to adjust the front derailleur limit screws and front derailleur cable.
    Technically you should have the bottom bracket shell faced. External bearings are aligned by the outer edges of the shell.

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