Has anyone switched from Schwalbe Marathon Plus tires of one width to another? I'm currently running 26x1.75 tires on my commuterized mountain bike. My rims should fit the 26x1.35 tire width. How much less inertia would these tires have in terms of accelerating off the line? There are quite a few stop lights on my route and getting the tires moving again each time a little bit easier would be nice.