Cracks in Tyres

godtabh

just noticed cracking in tyres. Not that old.

GP5000 with limited mileage

never noticed until now

Looks ok to me but probably needs replacing soon.

thoughts?

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monkeyslayer

Had similar with a pair of gp 5000s earlier this year, only about 1000kms on them on winter/spring roads... I'll never buy them again. Just not good enough for 50 euro tyres.

I'd bin them, a huge chunk of rubber could flake off or at worst completely split altogether.

07Lapierre

can happen if you over inflate yout tyres.

monkeyslayer

Can do but you'd want to be putting some serious pressure in there for that to be the cause, they're rated up to 110/120psi most people would be well below that.

godtabh

i would generally inflate to 120 psi but never had any issues with that pressure over the last 12/15 years

gmacww

120? Jesus that’s track pressure that. 5000 at 25mm width the max pressure is 120 but best not to ride that unless it’s perfectly smooth road. I normally ride 25’s at 6bar (about 90).

monkeyslayer

Same. 120 is crazy high for Irish roads. I'd usually go 80 90psi with tubes, max.

monkeyslayer

Having said that I wouldn't blame the pressure on the tyres failure, they're just poor quality, 4000s were my go to tyres for years, two sets of 5000s in and I'm done with them.

SchrodingersCat

I’ve had a pair of GP’s prematurely crack on me too. But I’ve had others that have lasted for a good while.
Im pretty confident the cracked ones happened due to where I stored the bike: it was in cheaply made shed that went through considerable temperature changes. We have another block shed for storage, which i never had the issue when I stored the bike in that.

Wishbone Ash

https://www.boards.ie/discussion/comment/122376970#Comment_122376970

120? Sweet Jesus. 80/90 is more than enough on Irish roads.

gn3dr

I do 100 psi in front and 110psi in rear. Have always done. Haven't seen cracks like that in GP5000's 23 mm.

07Lapierre

GP 5000 on 3 bikes with no issue. Great tyre.

magicbastarder

https://www.boards.ie/discussion/comment/122377082#Comment_122377082

I once read that 1psi per kg of body weight is a good ballpark for 25mm tyres.

G1032

https://silca.cc/pages/pro-tire-pressure-calculator

120 is very high alright.

Even at rider weight of 100kg in birthday suit plus 10kg bike and allowing 4kg for gear, shoes, food and water, 90psi should be plenty enough for 25s on Irish roads.

godtabh

https://www.boards.ie/discussion/comment/122378975#Comment_122378975

thats what I always went for. I'm no climber!

beggars_bush

Have had same issue with 5000s, lots of cracking

Changed to pirelli

90psi generally for tyres.

MojoMaker

Moved to Schwalbe Pro Ones a few years ago after having cracking issues with GP5Ks. Think the previous tyre was better suited to Irish roads/more durable.