• I thought Shimano pretty much announced Road Boost as a thing 18 months ago when they announced GRX with its 2.5mm wider chainline?

    So GRX 2 x equiped 700c x 50 / 29 x 2.2. Cool. Needed? Absolutely not. Nice to have options though.

  • The +2.5mm chainline effectively corrects a traditional 45mm road chainline to better match disc hub rear spacing (135/142mm spacing). You’d be looking at a couple more mm’s for a boost corrected chainline

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