OK, I have the tyres here at work and I have just measured weights on our calibrated Weylux 858CW. The 2.1 is 385g and the 2.3 is 440g. That includes the elastic band around each (for you weight weenies!). That is shockingly light.
Mark, if you could let me know if you still want these, I will send them off to you.
Mark, if you could let me know if you still want these, I will send them off to you.