What rims are on your Jamis? If it's the Alex Ace-19 - it looks like you can put 25's on it.) Higher pressure tires = less area contacting the ground = maybe faster (Basically, what Tulip said). 28's would actually be a big difference for you - that's what I ride on my Bike Friday and my Surly Cross Check (and I've done distance with both). I actually am riding 32's on my Lynskey, but may change to something narrower for >50 miles.




). 28's would actually be a big difference for you - that's what I ride on my Bike Friday and my Surly Cross Check (and I've done distance with both). I actually am riding 32's on my Lynskey, but may change to something narrower for >50 miles.
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