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Difference in tubular, clinchers and sewups(5 posts)
|Difference in tubular, clinchers and sewups||babalo|
Aug 13, 2002 4:17 AM
|What is the differences in Tubular, Clinchers, and Sewups?|
|Sheldon Brown knows all||DougSloan|
Aug 13, 2002 5:38 AM
|This site will tell you everything you might want to know (about a lot of other bike stuff, too). Would be happy to answer more questions if it doesn't, though.
|From Sheldon Brown....||biknben|
Aug 13, 2002 5:39 AM
This is the normal type of tire, with a separate inner tube. The tire consists of two hoops called "beads", made of steel or Kevlar cable, which are held together by cloth, usually nylon. The whole assembly is dipped in rubber, with thicker rubber applied in the tread area.
A clincher tire has a separate inner tube, which is basically a rubber balloon. This fits inside the tire, and the tire is mounted on the rim by lifting the beads over the edge of the rim. The middle of the rim makes a sort of valley, and while the tire is being installed, most of the bead can fit into this valley. This gives enought slack to allow the bead to be pushed or pulled over the edge of the rim, even though outside diameter of the rim is larger than the inside diameter of the bead.
Strictly speaking, the term "clincher" is slightly incorrect, as it applied to an obsolete style of tire which had ribs in the edges of the tire which fitted into grooves on the rim, where the tire was folded under the tube. The air pressure in the tube pressed the rib into the groove, and "clinched" the tire in place. People who are fussy about this prefer the term "wire-on."
A type of tire mainly used for racing. A tubular tire has no beads; instead, the two edges of the carcass are sewn together (hence the term "sew-up") with the inner tube inside. Tubulars fit only on special rims, where they are held on by cement.
Tubulars use Presta valves. You should never use valve caps or other screwed-on valve accessories with tubulars.
For most non-competitve applications, conventional clincher tires are more appropriate.
Most people find expensive tubulars too expensive for recreational riding...but cheap tubulars are distinctly inferior to good clinchers, particularly in that they tend to be lumpy and crooked.
Comparing high-quality tubulars with clinchers, including the rims, tubes, etc, tubulars save about 50 grams per wheel...but your bike winds up heavier, because you really need to carry a complete spare tubular, as opposed to a tube and/or a patch kit. This doesn't apply if the team car is carrying spare wheels/bikes for you.
If you don't glue your tubulars on properly, they can roll off, causing you to crash. If you get a flat on the road, you can't glue your spare securely, since the glue needs to dry overnight; as a result, you have to ride very gingerly on your spare, taking it really easy on the curves and descents. If you get two flats on the same ride, you're screwed.
Some people believe that tubulars corner better in the rain...but I never go fast on wet roads anyway. If you flat in the rain, your ride is over, because there's no way to make a wet tubular stick to a wet rim.
Tubulars are fairly immune to "snake-bite" rim cuts, and may offer slightly better "suspension" action than comparable clinchers. Their rolling resistance is actually worse than good clinchers in most cases, due to flex of the glued section.
Aug 13, 2002 6:08 AM
clincher is the type of tire you most probably are used to, seperate tube/tire combination where the tire is held to the rim via the tire bead.
Tubular (aka sewups) are tires which contain and integreated tube (sewn into the tire) held onto the rim by glue and air pressure.
|re: Thanks Difference in tubular, clinchers and sewups||babalo|
Aug 13, 2002 9:58 AM
|Thanks for the explanation|| |