Part of my commute involves riding on a cycle path on a humpback railway bridge. On the downhill side of it (traffic permitting) I ride off the path back onto the road. Do I risk damaging my tyres/rims if I do this on skinny 23mm tyres/Alex rims? Can I lessen the road impact? ...I just noticed - there's a lovely kit-car crossing that bridge. I think it's a kit-car, anyway.