Sorry, can't help you here. I come from a mountain bike racing background so I like to run narrower tires. It is what I got used to and so I still run them. I like the fact that I climb better on the narrower tire and that is my strength anyway. I am not that great at downhill so my speeds do not increase that much when I am not slipping as much. I gain more on the uphill than I ever will on the downhill. (Just too much of a wimp!)