Measured: you need just under 4cm from when the tyre enters the rim.
Thanks. My semi-slicks are 3.5 cm measured like that. I THINK that I will have more than that extra 0.5 cm clearance once the guards are fitted. They should arrive in the next couple of days, so I will soon find out!
Are the salty roads really bad for bearing? Or is it just bad for everything?
I sneaked a Christmas morning ride in one year and had to rush back for Christmas dinner so the bike didn't get washed that day. I remembered on Boxing Day and wheeled it out into my back yard to clean it. I discovered that the chain had rusted almost solid overnight, and miscellaneous other metal parts were looking sorry for themselves!
I'm not saying not to ride on gritted roads, but I am saying that you should clean your bike to get the salty grit off it before it can do any further damage. (It will always cause extra wear and tear on transmission and braking surfaces, but that's the price you pay for winter riding, and why I prefer to ride my cheaper bikes in the winter. If I could afford to replace more expensive parts more often then I would carry on riding the best bike with a pair of Crud Roadracers on.)