I just bought a pair of Zipp 303 with powertap rear hub and DT aerolite spokes. Now, two questions:
1) After a 150km ride with 2 long descents (which means braking in the corners), there is an almost 1cm long build-up of black 'dust' on the brake pad. This has happed on 3 outings now, so it is not just some 1st ride effect. I use the zipp carbon-specific brake pads. What is this? Is it the brake pad wearing down, or is it my cherished new rims that are being worn like butter?
2) I had the impression of less stability above 60-70kmh compared to my old wheels (Easton Cirquit on Cervelo Team). Is this because the DT aerolite spokes are too thin? Is it because they are not tight enough? Or is that simply unavoidable because the zipp rims are light carbon tubulars compared to the aluminium clinchers I had before?
3) When coasting down-hill, there seems to be an unbalance in phase with the wheel rotation, which I guess could be the valve+valve-extension. Is this normal? Does there exist lighter valves? Should I glue something of similar weight to the opposite side of the rim, Or should I simply live with it?
Thanks
Henrik
1) After a 150km ride with 2 long descents (which means braking in the corners), there is an almost 1cm long build-up of black 'dust' on the brake pad. This has happed on 3 outings now, so it is not just some 1st ride effect. I use the zipp carbon-specific brake pads. What is this? Is it the brake pad wearing down, or is it my cherished new rims that are being worn like butter?
2) I had the impression of less stability above 60-70kmh compared to my old wheels (Easton Cirquit on Cervelo Team). Is this because the DT aerolite spokes are too thin? Is it because they are not tight enough? Or is that simply unavoidable because the zipp rims are light carbon tubulars compared to the aluminium clinchers I had before?
3) When coasting down-hill, there seems to be an unbalance in phase with the wheel rotation, which I guess could be the valve+valve-extension. Is this normal? Does there exist lighter valves? Should I glue something of similar weight to the opposite side of the rim, Or should I simply live with it?
Thanks
Henrik