Bicycle Mechanics - Difficulty mounting Hutchinson Urban Tour tire
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03-11-11, 03:06 AM
I am having a helluva time mounting a new Hutchinson Urban Tour 700 x 32 tire on a wheel built with an Alex Rims x2100 rim.
I gave up before breaking something (or myself) and am gonna sleep on it.
I'm thinking of returning the tires and getting lighter 700 x 28s for commuting.
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.
03-11-11, 01:36 PM
Thank you for the detailed reply.
Your process is the same as I have always used, except for starting opposite the valve. I have always done the opposite (starting at the valve).
I tried it again without a tube, just to see, and I still couldn't get it on. I stretched the tire before mounting it by stepping on it and pulling hard. I did my best working the tire into the centre of the rim all the way around, to make use of the deep well. Still no luck. This tire has an extremely stiff side wall, thick centre section and is quite heavy, so I'm seriously thinking of returning it before I do any damage.
After another sleep :) I'll give it another shot, with the tube as you describe to see.
If you can't mount it onto a rim without a tube in it, quit while you're ahead and get something different. Wired-on tire beads can't be stretched - if they could they'd be blowing off rims - so what you see is what you get. Also don't forget that you may need to remove and remount a tire in the field, maybe with cold, wet, half numb hands, so it shouldn't be an epic struggle.
I' actually very surprised it's so difficult, because the rim is fairly deep, but then again it may appear deeper than it actually is. One question, you're not using a thick rim liner are you? That raises the working diameter in the middle.
03-12-11, 09:46 PM
Tried again, no luck. I think the thick, stiff sidewall (touted as resistant to slashes) makes manipulation tough.
Rim tape is standard plastic tape (Schwalbe).
Bought new tires, returning the old ones.
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