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Сообщение от mtbr.com The floatation and traction gained by using large-volume, low-pressure tires (we highly recommend the Surly Endomorph 3.7 tires) can get you over and through otherwise-unrideable terrain: ice, snow, sand, mud, wet rocks and roots. In many conditions, bigger is better.

http://www.mtbr.com/reviews/29er/product_125438.shtml