I have a 1976 peugeot 10-speed bike. What is the correct tire pressure? I ride over concrete sidewalks and rough, pitted asphalt roads and paths.
First, and especially with a tire that old, check it for wear. If it's cracked and dry-rotted, replace it. If there are visible rips in the sidewall, also replace it. If neither of those are the case, look at the sidewall of the tire. Most tires should have a PSI recommendation molded in the rubber of the sidewall somewhere.
Assuming the tire is in good condition, else it should be replaced. The pressure for the tire can be calculated with this tool (see Link). Also when you purchase a quality tire there should be a guide delivered with it that tells the pressure based on the weight of you + bike.
There are several other factors you want to take into account.
- The pressure on the tire is the maximum pressure you can go lower as that.
- You and only you can determinate the most comfort/effective pressure for the tire. For example Paris Rouxbais riders all have different pressure in their tires, some even have different pressure at the front and rear. Based on their own experience and comfort. Same goes for cyclo cross riders.