I am biking nearly every day to work and back (~ 3 km), but my trousers get damaged quite fast due to the created friction between my legs and the saddle. Which then means that I have to buy new ones rather frequently. Is there any way to prevent that?
Jeans and similar trousers wear fast on saddles. This is partly the seam on the inside of the leg, which is more of an issue on thick, high-friction fabric. They're also not very comfortable for riding in, especially if they get wet (including from sweat). Sitting in wet clothes when you arrive isn't much fun either, and smart stuff doesn't like being rained on.
My solution on commutes over about 8 km (5 miles) is to get changed. This also means I don't get chain oil on anything that matters. I'm not suggesting lycra as a default for commuting; apart from anything else pockets are useful at the ends. Gym shorts are good in summer, but in winter I suggest quick drying hiking trousers, and cheap ones at that. The pair I relegated to bike commuting have done a few thousand miles/km without noticeable wear.
I think you have a range of options:
- Ride all 3km out of the saddle (good upper body and quad workout and you can still coast while sitting in the saddle)
- Wear something other than expensive work clothes when commuting
- Place heavy tape on your trousers where they normally get worn (don't forget to remove it when you get to work)
- Buy a slightly narrower saddle with smooth contours. This might be less comfortable on a long ride but will provide less area for wear.
Here are a couple very cheap options for saddles on amazon
I haven't found a way to prevent it, only address it. I've used both good saddles (like leather Brooks) and more run-of-the-mill (WTB). I wear Carhartts usually and they certainly rip out prematurely. I'm lucky to (1) work wear I can get away with just about anything and (2) have a sewing machine with which I can patch the crotch, which is what I do. Reinforcing usually with the pocket of another old pair of Carhartts doubles the life, so the crotch goes about the same time as the knees.
One shouldn't have to muck with their saddle height to save their pants (saddle height should be wherever you like it to be) and one shouldn't have to wear special clothing to pedal around town or always be lugging around a change of clothes (lugging is for milk and beer). Perhaps as more people use bikes for everyday some of these manufacturers will start to reinforce the crotch like they do the knees.