Hey guys! I’m trying to decide between the 25c and 28c size of the Continental GP5000tl. It will be used mainly for crit racing. The wheels are Reynolds strike disc, 17mm internal and 25mm external. The bike will be a specialized allez sprint. Thanks!

Yea def 25 with that internal width, I’d be concerned during hard cornering with a 28c that will surely lightbulb on that rim and probably feel squirmy too.

First thing, it probably depends on your size. If you’re 130 go with the 25s. If you’re 225, go with the 28s. Second. 28mm tires on 17mm / 25mm rims won’t lightbulb that much and they won’t squirm. Plenty of folks have ridden that size tire on narrower rims and done so hard. I’m one of them. IIRC M…

What does the tire actually measure to, because on my 17.5 internal clinchers, my 25c GP4000 is 28mm. The 5000 is a bit more true to size but continentals still run big

Ya I’m 5’8” 139lbs. Thanks for the input!

Aero matters most on the front wheel, especially on a frame with a cutout like the Allez. Why not run 25 front, 28 rear?” Bigger contact patch where your weight is; probably better aero where it matters.

Help on choosing tire size for crit racing

Equipment

robcumine January 22, 2020, 10:30pm 2

I would go with 25mm. Especially with that rim will match well and you can run low pressure.

2 Likes

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Help on choosing tire size for crit racing

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