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Read the tire size on the sidewall of the tire and buy a tube that is the same size. Most of them are 26x1.75-2.00, but it could be 24 or even 29 depending on the size of the bike.
If you have a tubular tire (also called a sew-up), and you know that you have full-size wheels (either 700c or 27 inch), you need a 700c tubular. Tubular tires only come in a few sizes and the most common is the 700c. A tubular tire is a unique type of tire that usually has a tube sewn inside. This gives the tubular a round cross section and means that it must be glued onto the rim.
700c and 27 inch are actually different sizes (27 inch is slightly larger diameter than 700c), but they're often confused because they're so close and they're both found on road bikes - or have been over the years. These days, the common road-bike wheel and tire size is 700c. But, people still sometimes mistakenly refer to it as 27 inch, which was popular 25 to 30 years ago.
So, the bottom line is, if you get a tubular called a "27 inch" or "700c," it will be the same size and it will fit your wheel just fine. The size that you don't want is "650c." That size will be too small for your wheels. If you have something besides a tubular tire (if your tires aren't glued onto the rims, you don't have tubulars), to determine the size simply look carefully at the sidewalls. You'll find the tire size marked there if you look closely.
Some of this will depend mostly on what type of bike youre talkin' about here. Some cruiser/comfort type bikes will have the exact same rim size as nearly all mtn bikes and will swap with no problem but a 26 and 700 size wheel is NOT the same and there is NO compatibility between tires or frame of the bike including the fork. On a standard 26x2.1 size mtn tire the smallest you could go to is a 26x 1.50 that will fit on that wheel. if you have a French 26x1 3/8 size (S6) tire then the answer is the same....NOT compatible with anything 26" whatsoever. You cannot change the wheels either depending on the frame/fork you have. All you need to do is change the tires and keep the wheels! Any hardtail mtn bike will work fine as a commuter bike if you change the tires to a thinner and smoother tire for less rolling resistance.
Can you explain why you think the tires are too big? Do they NOT fit the rims? What condition was this bike in when you bought it? If the brake pads line up with the rims then the wheels are correctly sized for the frame.
Should be on the frame of the bike near or on the same lable as the VIN as are the tire sizes and wheight recomodations. The tires also have their maxine and min. pressures on the tires. Generally the rear tire will have 42 PSI and the front can run 32 PSI Tuning the way the bike steers and takes bumps can be done with tire pressure except never go below 28 PSI and never go above the highest number on the tire itself. If the bike doesn't have the trires on it the came with it new the best thing is to call the tech line for the makers of the tires and ask them telling them the bike the loads its going to carry and the exate tire size and model that your talking about. The pressures in the manual and on the frame and the ones for the tires that didn't come with the bike may work OK but if there other tires get the tiremakers recomodations. Many tires run best and last longest with the high number on the tire, but sometimes ride a little harder than you like.
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