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  • Looking at getting some GB guards for my crosscheck running 700x42 tyres and not sure if I should get 50mm or 60mm?
    Thoughts anyone?

  • I have some 700x42 marathon supremes under 60mm GB guards. They work nicely, although are quite flexy due to the compact frame geometry. I'm having to add a second stay on the rear.

  • Post pics when done please!

  • 50mm should be enough. I run 38c tyres under 45mm guards and it fits well. I used to run 28c tyres under the same guards and it looked a bit gappy. For the same reason, I think 42s under 60mm guards might look a bit off unless they're really knobbly tyres. Both should work fine though.

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