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ok, I have been riding 26" MTBs for years. I have always run a larger front tire. not sure why - everyone else was doing it. So what are the real pros and cons?

I just went from a Specialized adrenaline 2.2 front (measures 2.4) to a Purgatory 2.4. All I can say is Wow! Front cornering/braking traction is unbelievable. Now my Eskar 2.3 rear seems pretty weak in comparison.

So should I go with a 2.4 in the rear as well or should I go with a 2.2? Weight difference is only 45 grams between the two sizes.

I know you may or may not like the Purgatory or specialized, but my question here is mainly around should I run a 2.4 rear if I can fit it? and what are the pros of running a smaller rear tire?

Thanks...
 

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Its due to the fact that maintaining traction on the front wheel is more critical than the rear, the DH and AM crowd have been doing it for a long time too.
The XC guys tend to go for same size F&R so they keep the front end lower for climbing, and to maintain the aggressive geometry. I tried a 2.4 Nobby Nic on the F of the 575 just recently and had a blast, as the bike cornered so much better. Mad the front end a lot higher so climbing sucked (and there were a lot of steep climbs on that ride too!)
 
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