Join Date: Dec 2005
Location: Charlottesville, Virginia
Bikes: Dawes Kalahari, Puch Prima Super Sport, Graham Weigh 853
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Well, they might help you on bumpy sections purely because of the extra air volume. It might be worth a shot. Also, what kind of tyre pressure are you running in those Grifos? I used to run 50psi in mine, but when I finally got ok at missing pinch flat type obstacles I took them down to the 25-35 range and my cornering grip improved.
Also, how old are those Grifos? Older ones don't have side knobs, and those knobs really help with traction on corners and off-camber sections.