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I always go big as possible but remember mud-clearance.
What have previous racers used? That should give you an idea of where tyre choice is heading for it.
hippy-
Tyre choice is all over the place for starters, but finishers generally all have 42 or 45mm with medium knobbles.
Teravail Cannonball seems popular, that's a 42mm tire that comes up bizarrely narrow (38 in BRR test), but gets a terrible review from bicyclerollingresistance, despite Jaimi Wilson winning on them, and Angus Young coming in first before being disqualified last year.
Getaways have identical volume and "should be" better in every way (according to numbers)
There's also a bunch of G One variants and Riddlers are relatively prevalent.
barry
Thanks! Sadly Bicyclerollingresistance doesn't have data for the SG2 version of the Riddler, so the feel is all I have.
According to them Challenge Getaways should be extremely puncture resistance and have ridiculous low rolling resistance, but surely they should be too fragile? Also feel I'd be pushing it at 40mm, instead of 45.