eastcoasteddie

Hey guys,
I hope everyone is safe and healthy in these crazy times.

I have a 2015 Giant Anyroad Comax that came with Giant PX-2 wheels and 700x32 PRX-2 tires.
i just got a pair of the same tires in 700x40 size along with Continental 700x32/47 tubes.

Everything came together just fine, but there seems to be a weird dip in one section of each tire. Looks like the tire bead doesn’t want to seat properly .
I have tried to deflate and adjust the bead seat while slowly inflating with a floor pump multiple times, but can’t seem to get it to sit right.

i have read that any tire between 28 and 50 will work on these rims.

anyone have this happen before? Is there a secret to setting to bead right?

photo:
You can see where the reflective ring dips down in the center of the photo compared to the sides - I have marked it with red arrows...


thanks for any help in advance...

Russ Roth

two ways to attempt to deal with it, when you have about 40-50psi, your strength dependent, you put the palm of your hand at that spot, curve your fingers over the top of the tire and sort of try to peel the tire up and away from the bead at the same time. Can also just use your thumbs to do the same thing. Do not worry, the tire can't pop off the the rim that I have ever seen or heard of. The pressure means that the you are barely able to move the tire away from the rim and once the bead catches it won't move.
The other is to inflate the pressure to the tire's max, somewhere around 100-120psi, if you do I highly recommend you wear hearing protection, 99 out of 100 times (my own made up statistic) the tire will seat with a load pop or bang and you can then let the air out. That other 1 time the tire will slip off at the other side since there is enough slack to do so; this will sound like a shotgun going off next to your ears which will ring for a couple hours. Course install enough tires and you'll do this by accident a few times and I try to only use this method as a last resort.

shrimp123

minor correction : MIN of the max recommended pressure of the rim and tire.
(probably fine since it is a wide tire whose max psi will be less than rim, but just in case)

Retro Grouch 

1. Where is this dip located relative to the valve stem? If it's exactly opposite, try deflating your tire, push the valve stem down into the tire and re-nflate. It works because it frees the thick part of the inner tube from being caught under the tire bead.

2. Another trick I've used is spraying the tire beads with windex in that area prior to inflation.

freeranger

Went thru the same thing recently, while putting a new tube in my wife's bike. Seems no matter what I did, that the tire had a "dip". I did put some talcum powder on the tube, so the tube wasn't "grabbing" anywhere. Finally, I overinflated the tire just a little,let it sit overnight, and it was fine the next day. Maybe if had moistened the tire bead a bit I wouldn't have had to wait overnight for it to set up. Guess I'll try that next time.

JohnDThompson 

Deflate the tube, and dribble some soapy water into the area that is not seating properly. Slowly inflate the tube again; the soapy water will lubricate the bead and should allow it to slip into place.

eastcoasteddie

Thanks for all the suggestions.
the dip is not opposite the valve stem, at least on the front tire - more like 60° away from the stem. I don’t remember off the top of my head where the rear is.

i will try all your suggestions today.
I also have the same tires to replace on my wife’s bike as well...
Thank you!!!

Sy Reene

Obvious question, but have you checked that the reflective stripe isn't just applied off-center.. ie. is the distance between the stripe and the knobbies the same all around the tire?

And/or.. are both tires on both wheels doing the same thing, or the 'faulty' tire transferred to the other wheel?

eastcoasteddie

reflective stripe Positioning is not the problem. When I spin the wheel on its axle, I can see the dip in the tire.
both tires do it.

So today, I pumped the rear tire up to 85psi (75psi max is printed on the tire) and I heard the bead pop into place. Rear is good now.
I did the same with the front, no change. I deflated it and put some liquid soap on the rim and tire in the dip spot. Pumped up to 85 - no pop. I will let it sit for a while and see what happens as I replace the tires on my wife’s bike.

VegasTriker

The bead did not seat in the area where you have the dip. Had just this occurrence recently after fixing a pinch flat. It was a 700C wheel with a 28mm tire. First and second time inflating the tire left me with the same dip you have. On my tires there is a line right at the point where the tire and rim meet. When the tire is properly seated you can follow the line around he rim and it will be evenly spaced from the rim. I ended up soaping the tire and rim with diluted dish detergent and then inflated the tire to the maximum of 110 lbs. A few seconds after I reached the maximum pressure I heard a light pop as the tire seated. No more dip.

eastcoasteddie

When I just replaced the tires on my wife’s bike, I cleaned the inside rim edge with a Mr. Clean solution, and then soaped the tire edge. Both tires inflated perfectly...

I took my front tire off again and did the same, but still had a slight dip on one side. Pumped it up to 85 and after about 5-10 minutes heard the pop of the bead. Finally...it’s a success..

my wife’s bike is a LIV Invite Comax, the female version of my Anyroad. Her’s has slightly less true clearance and the 700x40 is the largest tire that will fit.

photos:




Mine can probably go to a 42 or so safely...but I don’t need to at this time...






thanks again for all the suggestions!!!