follow NYbikers' advice but also remember it depends on the steepness and length of the descent. You may actually have to stop at some point and let your rims cool off a bit. This especially true if there are also curves involved. On a long straighr roller where you can see what is coming you can afford to let yourself run out a bit and then feather to slow and then run out again and feather again. However if there are curves inbetween, you definitely have to slow more to get around the curve and then can't really let yourself run in between, hence to need to stop and let your wheel rims cool.

marni