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  • Is that 18mm difference going to be a problem? I assume the answer is yes!

    It will make a difference. Whether that amounts to a problem is another matter. Do you want to steepen the head angle by 1°, reduce the trail by 7mm and lower the BB by 8mm? That still leaves well inside the range of ridable bikes, assuming your starting point isn't anything radical, but you can avoid doing any of that by picking a 400mm AC fork, which is a common enough size, e.g. Surly Straggler

  • Thanks, and thanks @edscoble - It's currently a Croix de Fer 10 (2015 model) Steel Fork. I want to change it to put a 180mm disc rotor on there, which as I discovered today, does not fit on the stock fork!

    Think the surly fork is also 160mm max rotor size as well but will double check.

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