Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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I checked the profile of your x2100 rim and it has a fairly deep well at the center which is the key to easy tire mounting.
Lets, start with the basics, so we don't miss anything. The inner diameter of tires is less than the outer diameter of rims, which is how they stay on. So therefore the only way to mount tires is to offset most of the tire to a lower diameter (deeper) section of the rim and push the slack around to one place to get it over the rim. Essentially you're making a circle into an egg shape and working with the pointy end. That's the basic principle, and as you see it doesn't call for force and stretching as much as it does finesse.
Here's how I mount tight tires.
tire back, insert valve
1- mount half the tire
2- inflate the tube only enough to make it into a sausage
3- pull tire aside, put valve in to the valve hole, and flip tire over the valve
4- starting at the valve and working in both directions stuff tube up into the tire, without twists, and masage it so the tube in over the rim and the tire resting against it. Check that the valve is still straight, If not horse the tire around until it is.
5- starting opposite the valve, massage the tire over the rim in both directions working as close to the valve as you can without working hard. It should be no effort until the last foot or so.
6- bleed air from the tube, and starting opposite the valve, push the tire into the middle and push the slack around toward the valve.
7- working both ends of the last section toward the valve, grab the tire and roll it back while lifting the bead with the thick pad at the base of your thumb. (if you do enough tires you'll get a callous there which helps)
8- finish by pushing the valve into the tube to lift any section of tube you might have trapped under the bead (important step with narrow tires), then gently pull it back down into position.
9- inflate enough to give it shape, and check that the tire is evenly seated all the way around using molded lines (not color) as a guide. Once it's even, inflate to about 25psi or so and check again. If all looks good inflate to riding pressure.
The key is to start opposite the valve, because the valve's width will otherwise keep the tire out of the rim's deepest section robbing you of some working slack.
BTW- the entire job should take less time than typing this did.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
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