With rainy season approaching I've been thinking about building up a rain bike. It'll be single speed/fixed or a gearhub. Anyone know a good chainguard? The ones that come up in my searches have the guard along the top end of the chain run. I guess that's good for keeping grease off your pants legs but what I'd like is a guard along the underside of the chain that will keep road spray and grit off the drive train, since I think that causes a lot of wear and tear.