Tube / tyre of different sizes ?
Posted: Mon Feb 18, 2013 9:38 pm
Hello
So I have got that old road bike which I just bought (tubes and tires to change). I have checked on the existing tyre and it was written "27 * 1 1/4". Fine, I went to the bike store, asked for "27 * 1 1/4" tires and tubes, the guy asked me if I was really sure, I said yes, went home and tried to fit everything on the bike. Except that when I removed the old tyre, I noticed that the inner tube was size "700/something" (maybe 30, I can't remember now). How comes? Did the previous owner make a mistake? Was I supposed to buy that last size for the inner tube?
Anyway, I don't like spending money for nothing, I still put everything on my bike. The tyre size looks good, maybe a bit large (I remember that it's lots of sport to put a tyre on my mountain bike, these new tires are Schwalbe brand, maybe they usually are on the large size?), but well tight enough, not too bad. The tube looked way too big before I inflated it. After it's been inflated, I don't know because there's the tyre on it, but it's probably not even touching the inside rim of the wheel. Will it be a problem if I was supposed to use a smaller size for the inner tube?
And what's that psi recommendation on the tires? Do people really have a machine to measure the pressure? I just wanted to ride a bike, not to get an engineering diploma... :/
So I have got that old road bike which I just bought (tubes and tires to change). I have checked on the existing tyre and it was written "27 * 1 1/4". Fine, I went to the bike store, asked for "27 * 1 1/4" tires and tubes, the guy asked me if I was really sure, I said yes, went home and tried to fit everything on the bike. Except that when I removed the old tyre, I noticed that the inner tube was size "700/something" (maybe 30, I can't remember now). How comes? Did the previous owner make a mistake? Was I supposed to buy that last size for the inner tube?
Anyway, I don't like spending money for nothing, I still put everything on my bike. The tyre size looks good, maybe a bit large (I remember that it's lots of sport to put a tyre on my mountain bike, these new tires are Schwalbe brand, maybe they usually are on the large size?), but well tight enough, not too bad. The tube looked way too big before I inflated it. After it's been inflated, I don't know because there's the tyre on it, but it's probably not even touching the inside rim of the wheel. Will it be a problem if I was supposed to use a smaller size for the inner tube?
And what's that psi recommendation on the tires? Do people really have a machine to measure the pressure? I just wanted to ride a bike, not to get an engineering diploma... :/