jim beam wrote:

most shops use the following rule of thumb:

25mm max for 1" steerer
35mm max for 1 1/8" steerer

deviate from that at your own risk because it may affect warranty.

That, like most "rules of thumb" is a gross oversimplification.

In the case of forks with steel steerers, especially 1 1/8 ones, there's
no need to cut the steerer at all, if you want it that high.

For aluminum or plastic steerers, strength is an issue, and those "rules
of thumb" might have some merit with such steerers.

Sheldon "Materials Matter" Brown
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