tire tube

I don't know myself . I have left the originals on, they are supposed to be very good tires
 
It's not going to be a problem, @Cupid tubes are designed to inflate a considerable amount beyond the listed size. Your 26 x 2.125 will be just fine! Thorn resistant tubes are a good upgrade, like Ravi suggests--they're generally 4 times thicker than a regular tube and adding tire liners, like Mr.Tuffies or a similar product are about the closest to flat proof as you'll get.
 
Anytime! What are your thoughts and experiences with your ST1? We'd love to see pics and hear more about your bike :)
 
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