Mr Tuffy's legendary tire liners prevent puncture flats using their lightweight, super-durable urethane liners. The new XL series is made for fat bike and fits tires up to 5”.
2XL fits 26”/29” x 2.35”-3.0”
3XL fits 26”/29” x 3.1”-4.0”
4XL fits 26”/29” x 4.1”-5.0”
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So far have not had a flat since installing the liners.
I ride the fat tire bike on a lot of different terrain and had a couples of punctures in the past, So far no problems since installing the liners.
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