bike thumps per rev-seating bike tire?

Question

OK, someone asked the first part of this question previously and rcv all guesses- the answer is the tire isn't seated properly.

The question is how to successfully get it done.
I have two that way and managed to get one seated.
Maybe I just don't have enough air pressure to get it done for the other. I have put as much as 95# in a max 70 rated tire.
How much air will blow the tire?
I know where I can get to about 120#.


If it doesn't get seated I guess it may as well blow.

I have:
insured no tube in way
insured tube not twisted.
replaced liner and it is out of the way
used talcum on the tube
used lots of liquid dish detergent
insured valve is pushed into tire before inflating - it wasn't once.
twisted and bounced tire

luck on one not other.
tire is 27x1 3/8 - rim is 27x1 1/4
tube matches

next shot is 120# of air. It either seats or blows.

Answer 1

The biggest reason the tire won't seat is the tube is in the way. Get the tube out of the way and the tire will seat nicely. If you go riding it or pumping the pressure up, you are likely to have a blow out.

If the bulge is at the tube's stem, prior to inflating the tube, you need to partially push the valve stem up inside the rim to push the tube out of the way of the tire's bead. You might have to wiggle things about a bit to get the tube entirely out of the way.

Then inspect the rest of the tire to insure the bead is correctly seated prior to fully inflating the tire. To do this, put a small amount of air in the tube. Then depress the tire with your thumbs and look at the tire's bead inside the rim. If you put so much air inside the tube you can't depress the tire, you'll have to let a bit out. In any case, if you see inner tube between the bead and rim, you need to work the tire back and forth until you get the tube entirely inside the tire. Work your way entirely around each side of the tire to be sure all is cool. Then inflate the tire. When finished you should see the very fine line that runs around the tire is a nice uniform distance from the outside of the rim. If it is not, you may still have a bit of a pinched tube and you need to start the process over.

It takes a bit longer to change a tire when you do this inspection, but it takes a lot less time than changing it again.

I've never used the baby powder trick, but I know other folks do it and it helps.

Hope this helps you out.

Answer 2

Having TWO badly seated tyres is rather odd !!!!

Firstly, overinflating your tyres won't solve the problem.

Secondly, If you're using presta valves, put the knurled
retaining screw on, AFTER you fitted the tube!

Thirdly, you have got the correct size tubes, haven't you?

Sorry to sound like I'm treating you like an idiot, but sometimes, we all overlook simple things such as this!

Answer 3

if your tire isn't seated properly - you should be using baby powder in the rim and tire when you mount it. it will lubricate the rubber enough to have the bead "pop" when you inflate it. don't bother over inflating, lube the tire.