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Old 01-29-2020, 07:37 AM
Carl Strong Carl Strong is offline
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Join Date: Aug 2009
Location: Bozeman MT
Posts: 151
I hope you don't mind my chiming in here. I noticed I didn't do a very good job of explaining tire sizes so I thought I'd clarify. I had one typo in my breakdown which is corrected here:

Road Fork – Tires up to 30 mm
All-Road Fork – Tires up to 37-40 mm
Gravel Fork – Tires up to 55 mm and even a bit larger
MTB Rigid Fork – Tires up to 3 inches
MTB Suspension – Tires up to 3 inches

Each of these increments is based on commonly available aftermarket forks (ie Enve, Columbus, Whisky, etc). The tires sizes are the MAX tire size that will fit in the fork. Anything smaller will also fit.

So the tire size range for the above would look something like:

Road Fork – Tires 23-30 mm
All-Road Fork – Tires 30-40 mm
Gravel Fork – Tires 40-55 mm
MTB Rigid Fork – Tires as big as 3 inches
MTB Suspension – Tires as big 3 inches

I don't really think there is a clear distinction between an all-road and a gravel bike. But at some point you jump in tire size capacity from 40 to 55 based on the readily available forks.

Hopefully, that makes a little more sense.

One other point I'll make is that the reason I wrote this was because everybody's language seems to vary. One person's idea of an all-road is different from others. My goal was to point out the considerations that are made when designing a bike so we could focus on the bikes design to assess its nature, rather than the label that was applied to it.
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