I've been bombarding Adrian with questions, whilst trying to brace my credit card for the onslaught! Trying to decide which rims to go for at the moment, I've had good service from Mavic F519's in the past but SJS seem to think the replacement 819 is a bit lightweight. Cass Gilbert says the Carbide rims are superb but you have to use the special pads, ordinary ones last about a week!