The last time was when I bought a new mountain bike, (3 years ago). I went off road with the stock tires that came on it, and both tires went flat in one afternoon from thorns. I put Conti's on it and haven't had another one yet.
The last time was when I bought a new mountain bike, (3 years ago). I went off road with the stock tires that came on it, and both tires went flat in one afternoon from thorns. I put Conti's on it and haven't had another one yet.