GP5000

[Random84]

I was looking for a new GP5000 clincher tyre but noticed a tubeless tyre for sale at a reasonable price but looking at the photos it looks like the rubber has started cracking or am I seeing things?



They're older GP5000 TL (not the newer TR tyres), I'm guessing they were taken off a bike and stored away as cyclists never throw tyres away even when they're worn .

Also, is it worth going tubeless on a road bike? Do you notice any improvements? I can only fit a 700x25 so I probably won't be able to run lower pressures. My MTB's are tubeless and it's brilliant but I'm conscious that the tyre pressures are much lower and there's a bigger volume of air.

[esuuv]

In my opinion yes tubeless is worth it - a little bit of effort to get them set up, but if you know what you're doing from MTB then it's pretty straightforward.

Pressure wise - use this calculator to see what pressure you should be running - continental tyres tend to run big, I have 28mm GP5000TR's on Zipp 303s wheels on my road bike and they measure 30mm width.

https://silca.cc/en-gb/pages/pro-tire-pressure-cal...

[Random84]

Thanks, I didn't even realise there was something as precise as that, I tend to pump the clinchers up to 100psi and jump on!

[Wardy78]

Shouldn't really crack like that, but I'm not sure it's structural.

I have GP5000 tubeless (TR) on 2 of my bikes. This is the one that's in my office, Tyres are 4 months and c3000km old. Mine look more worn but no real cracking (although in the photos, it doesn't look a little like they are). They are fabulous tyres. This bike came with ENVE SES tyres. They were crap in comparison.



As for pressures and being worth it on a road bike.

Worth it - 100%. Especially with GP5000s

Pressures, it's partly a personal thing, partly a brand thing, partly a clincher vs tubeless thing. I run my GP 5000 tubeless at c50psi. My tubed GP5000s at 100psi (if latex tubes, TPU a bit less). My Vittoria Cross at 120psi.

[frisbee]

GP5000s crack on my bike I keep on the floor of my garage through the winter. Indoors or stored in a wheel bag hanging on a wall of the garage seem to be fine.

[Wardy78]

My bike above is hung on the wall aside from when I'm on it, in my office, in my house with normal house temperatures.

[Master Bean]

No, no and doubly no. No to the TL for fitting. No to 25mm tubeless. Just no.

[Random84]

Okay two posts suggesting it's worth it and one against, Master Bean why are you so against them? Have you had a traumatic experience with tubeless?

[Master Bean]

Random84 said:

Okay two posts suggesting it's worth it and one against, Master Bean why are you so against them? Have you had a traumatic experience with tubeless?

Fitting the TL was a disaster. Maybe you'll have better luck. Most people on road tubeless are using 28mm or above. Even Tadej off of that France race is using 28s.

[Wardy78]

I'd missed the 25mm.

Huge supporter of tubeless, but 28/30mm, not 25.

That said, I've not had reports of bad experience of 25mm TL (and the pro peloton's move to 28/30 even 32 for rougher surfaces) way predates Tubeless, they were moving towards 28 with Tubs.

[Random84]

Yeah after doing a bit more research 25mm or less just doesn't seem to work. Low volume and high pressure results in a mess, sounds like the sealant is simply blown out and you loose a lot of air in the process (and it's unlikely to seal).

28mm upwards and it seems to make sense, larger volume and you can start lowering the pressure which helps when trying to seal a puncture.

Oh well I'll stick with clinchers, at least I only need to buy one tyre (to replace a worn rear clincher) rather than 2 new tubeless tyres and the required kit to fit them!

Thanks all

[ukbabz]

Wardy78 said:

I'd missed the 25mm.

Huge supporter of tubeless, but 28/30mm, not 25.

That said, I've not had reports of bad experience of 25mm TL (and the pro peloton's move to 28/30 even 32 for rougher surfaces) way predates Tubeless, they were moving towards 28 with Tubs.

On my old bike I didn't have any issues with 25mm GP5000 running tubeless. I guess there's an aspect of luck and also depends on how much pressure you're riding.

[Wardy78]

Pressure is a key element. I've only ever had one puncture that I've known about with tubeless, and that when I was running more like 60/65psi. It was a sizeable hole that wouldn't initially seal, but did do when the pressure dropped to 50.

[Gribs]

If you're near Leeds you can have an unused 25mm GP5000 TL for free. I tried to fit it onto an Ultegra wheel and whist I could just about get it on at home after a fight I'd have no chance getting a tube in in an emergency. For reference I can take normal GP5000's on and off easily.

[Random84]

Yeah if I was a lighter build and could ride at a lower pressures it probably wouldn't be so bad but.........I honestly can't remember the last time I had a puncture using GP5000 and GP4000 clincher tyres (well and truly jinxed myself now). My tyres are always set at 100psi before a ride and even riding behind a tractor cutting hedges with thorns going everywhere the other day I still got out of it scot free!

It's on a summer bike which never goes out when it's windy or the roads are covered in the usual rubbish.

I was kind of expecting everyone to say it's a game changer with a noticeable difference in speed but I'm surprised that isn't the case.

That's very kind of you Gribs, unfortunately I'm in North Wales but I'm happy to pay to postage and chuck some money in a charity tin if you want to get rid of it!

[emicen]

I run 25mm tubeless GP5000s on my C36 rims. No issues setting them up and I’m 90kg so run them at pretty high pressures.

Only had 1 noticeable puncture when it sprayed a bit of sealant but sealed it instantly and didn’t need to top the tyre up to finish the remainder of the ride.