GP5000 TR issues
Discussion
I have changed my Pirelli P Zeros over today and am having problems setting up the GP 5000's.
Initially the issue was the tyres would not pump up at all on one of the wheels. The other was fine. No difference in technique to the P Zeros but the track pump wouldn't get any air into it and I had to go to a local mechanic who ended up using a compressor.
Then once both wheels were sorted, the rear is not holding air. There is not even any sealant in yet, I was just testing the seal. Goes from 100 PSI to 40 PSI in 60 minutes. I didn't want to keep it at 100 but just wanted to test it as I KNEW there was going to be an issue. I ended up taking the tyre off to check the rim tape in the one that won't hold, and now once again, I can't re-inflate it as I can't any air into the tyre like I had with the other one. I never needed anything other than a track pump before, so I don't understand what all the issues are.
Its really stressing me out, it just makes no sense, the rims, tape and valves are all new and as it should be.
Is this a GP5000 thing or just the joys of tubeless?
Initially the issue was the tyres would not pump up at all on one of the wheels. The other was fine. No difference in technique to the P Zeros but the track pump wouldn't get any air into it and I had to go to a local mechanic who ended up using a compressor.
Then once both wheels were sorted, the rear is not holding air. There is not even any sealant in yet, I was just testing the seal. Goes from 100 PSI to 40 PSI in 60 minutes. I didn't want to keep it at 100 but just wanted to test it as I KNEW there was going to be an issue. I ended up taking the tyre off to check the rim tape in the one that won't hold, and now once again, I can't re-inflate it as I can't any air into the tyre like I had with the other one. I never needed anything other than a track pump before, so I don't understand what all the issues are.
Its really stressing me out, it just makes no sense, the rims, tape and valves are all new and as it should be.
Is this a GP5000 thing or just the joys of tubeless?
CO2 has seated the tyre well, so thats that issue solved and I will buy a airshot or similar to above.
But the rear is still going from 110PSI to flat in 15 mins. For no reason at all. I have checked everything but it wont hold. Going to add sealant now but I now and re-pump but I know it wont hold.
With the valve core remover, why is it that when you turn it in either direction, the valve still gets loose? i/e you tighten it but if you keep tightening it in the same direction it goes loose again?
But the rear is still going from 110PSI to flat in 15 mins. For no reason at all. I have checked everything but it wont hold. Going to add sealant now but I now and re-pump but I know it wont hold.
With the valve core remover, why is it that when you turn it in either direction, the valve still gets loose? i/e you tighten it but if you keep tightening it in the same direction it goes loose again?
I've just chucked in sealant and ridden them a mile. Will wait and see. Shop beckons.
I never even wanted tubeless, I ordered new wheels via my LBS and it was never discussed, of course naturally they were tubeless. They are fine for a few months at a time once setup but the issues come when 1) they puncture or 2) tyre changes. I can do tubes / tyres in minutes - tubeless takes around 24 hours and a trip to a shop. Its utterly ridiculous.
Seeing as I paid out for new wheels I am going to have to suck it up, but I am never buying tubeless again. Interesting that the riders on here all say tubeless is great, however riders and shop mechanics I speak to all generally say the opposite.
I never even wanted tubeless, I ordered new wheels via my LBS and it was never discussed, of course naturally they were tubeless. They are fine for a few months at a time once setup but the issues come when 1) they puncture or 2) tyre changes. I can do tubes / tyres in minutes - tubeless takes around 24 hours and a trip to a shop. Its utterly ridiculous.
Seeing as I paid out for new wheels I am going to have to suck it up, but I am never buying tubeless again. Interesting that the riders on here all say tubeless is great, however riders and shop mechanics I speak to all generally say the opposite.
I would never get tubes in - no way. The gap is absolutely tiny - wuld barely fit a little finger in there.
However -
I put some sealant in the one that kept deflating, span it, rode it, left it. After a bit of time it seemed ok so I put a load more air in the tyre and rode it again - and haven ow left it again. It is not deflating as it had been, but I need time to trust it and work out whats going on. I don't see why one of them went on with no issues and held perfectly without sealant, and the other was the complete opposite. But, if that's all part of the experience then so be it.
I will be able to report back this eve or tmrw - if I have solved it then I have performed a miracle as I have had no outside help.
However -
I put some sealant in the one that kept deflating, span it, rode it, left it. After a bit of time it seemed ok so I put a load more air in the tyre and rode it again - and haven ow left it again. It is not deflating as it had been, but I need time to trust it and work out whats going on. I don't see why one of them went on with no issues and held perfectly without sealant, and the other was the complete opposite. But, if that's all part of the experience then so be it.
I will be able to report back this eve or tmrw - if I have solved it then I have performed a miracle as I have had no outside help.
As the rims are fairly new and the valves are brand new out the packet I suspected it was purely the tyre. I have had a a spin and listen but no air audible, and once sealant in also no sealant visible anywhere.
Will monitor and update - might have been just one of those things. But one thing is a consistent - its always hard work and problematic undergoing this process!
Will monitor and update - might have been just one of those things. But one thing is a consistent - its always hard work and problematic undergoing this process!
They are DT Swiss RR 521's I had made up by my local wheel builder / bike shop. They have been great. The P Zeros I got on and off no issues, I heard GP5000s were a nightmare to get on and off hence why I waited so long. Getting them on was tricky but I managed, however, when on and sat in the middle of the rim as recommended, this is where the "tiny gap" was.
Having now seated them, I can see that I could unhook one side and try a tyre, however, they do feel very tight and much less room inside than a standard clincher.
The back wheel has appeared to have held, so I am hoping I won't need to touch it again. I am still stumped how one held full pressure with no sealant and the other collapsed. However the one that held was the one that was blown up on Halfords compressor. The one that didn't was the one I used my track pump on. Is it possible that despite numerous cracks it wasn't properly seated? When I used CO2 it this morning it cracked louder and quicker and it seems to have held since.
Having now seated them, I can see that I could unhook one side and try a tyre, however, they do feel very tight and much less room inside than a standard clincher.
The back wheel has appeared to have held, so I am hoping I won't need to touch it again. I am still stumped how one held full pressure with no sealant and the other collapsed. However the one that held was the one that was blown up on Halfords compressor. The one that didn't was the one I used my track pump on. Is it possible that despite numerous cracks it wasn't properly seated? When I used CO2 it this morning it cracked louder and quicker and it seems to have held since.
I have been running tubeless (blind) since March 2023 - this week during this episode was the first time ever it has come to light that you "have to use compressed air". My previous tyres went on with track pump every time, no issues.
But the fact I have managed to get the notorious GP5000s fitted, on own, demonstrates that I have some competence. I am going to order tn air compressor thing, if thats all I need then so be it. But so far, my experience has been negative - time consuming, messy and inconsistent when trying to deal with tyre changes or changes in sealant. And, the times that I have punctured have been catastrophic. I have halted club rides twice - and between 8 to 10 seasoned riders, none of us have been able to resolve the issue - so as much as an idiot I maybe, everyone else must be too.
But the fact I have managed to get the notorious GP5000s fitted, on own, demonstrates that I have some competence. I am going to order tn air compressor thing, if thats all I need then so be it. But so far, my experience has been negative - time consuming, messy and inconsistent when trying to deal with tyre changes or changes in sealant. And, the times that I have punctured have been catastrophic. I have halted club rides twice - and between 8 to 10 seasoned riders, none of us have been able to resolve the issue - so as much as an idiot I maybe, everyone else must be too.
Well, I will say having just been out on my first ride on the GP5000's, it was probably worth the hassle. They do feel nice, hard to say its black and white from the P Zeros but they do seem less sluggish. I think I have gained around 0.5mph average over 30 miles judging by todays ride. They have redeemed themselves for now anyway.
z4RRSchris said:
i have about 2 flats a year on latex with a mix of GP5000's and corsa speeds.
the time when your at the side of the road with some numpty on tubless, s
t spraying everywere as it wont seal, him jamming plugs into it and then giving up and having to put a tube in it anwyay.
thats when you realise tubeless is stupid.
Exactly that, and what has happened to me when mine have gone. Other than I could never put tubes in mine as the dynaplugs have a brass nipped which won't detach once in (otherwise it all opens up again). So if plugging doesn't work it is walk / train.the time when your at the side of the road with some numpty on tubless, s
t spraying everywere as it wont seal, him jamming plugs into it and then giving up and having to put a tube in it anwyay. thats when you realise tubeless is stupid.
Edited by Random_Person on Monday 17th June 20:09
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