(Road) tyre and brake questions

wersal gummage

Hi folks

Can anyone advise if there are certain tyres that can be inflated to a very high psi? Current tyres are 120 max but even at 130 the back doesn't have enough air for my body weight....

Secondly, any difference in replacing just the brake pads as opposed to pads and shoes? Replaced just pads last time and wondering is it OK to do this again or do the shoes need replacing at a certain point?

Thanks!

Raam

Tubs go higher. But they are really not the most practical for everyday riding. Perhaps you could go for wider tyres if your bike will take them.

I never changes the shoes on my brakes, only the pads.

Lusk_Doyle

I only change the shoe when I mangle the allen key head on the bolt for the pad. Which is usually when I am changing the pads ;(

Cee-Jay-Cee

Shwalbe Luganos take 130psi which is very solid, I usually keep mine around 100psi but then again I'm not exactly overweight (12st)

seany15

I usually run vittoria rubinos in winter, and they take 145psi. They're a decent all rounder and usually fairly competitively priced.

wersal gummage

CJC999 wrote: »

Shwalbe Luganos take 130psi which is very solid, I usually keep mine around 100psi but then again I'm not exactly overweight (12st)

Thanks. I'm not actually overweight for what it's worth , I'm 100kgs but have a very low body fat percentage and I'm quite tall. Just heavy!

wersal gummage

seany15 wrote: »

I usually run vittoria rubinos in winter, and they take 145psi. They're a decent all rounder and usually fairly competitively priced.

Thanks. 145 sounds like what I need

ford2600

wersal gummage wrote: »

Thanks. 145 sounds like what I need

Just get a wider tyre.

You'll get away with a much lower pressure on 28 or slightly less with 25

wersal gummage

ford2600 wrote: »

Just get a wider tyre.

You'll get away with a much lower pressure on 28 or slightly less with 25

Have 25s at the moment and 130psi isn't enough. 28s won't fit on the bike, barely have clearance for the 25s

BadCharlie

I'm 100kg about. Sometimes lower and other times higher. I pump my front to about 100psi and the back to 110 and I think they are fine. 25mm continental gp4000 I'm using.

quozl

wersal gummage wrote: »

Have 25s at the moment and 130psi isn't enough. 28s won't fit on the bike, barely have clearance for the 25s

This chart is a good guide to pressure for weight/tyre width.


Even if you have 60KG on your back wheel you should be ok with 120 PSI.

Why are you sure that 130 PSI isn't enough? Are you getting pinch flats?

Are you sure that your tyres really are 25mm wide, there can be quite a bit of variety between different manufacturers tyres at the same claimed width. I'm really surprised that a 25mm tyre and 130 PSI isn't OK for you.

wersal gummage

Thanks for that.

I'm not sure if they are 25s, they say 25 on them.. Gatorskins. Which I'm happy to replace for the summer anyway. This is on my training bike. 130psi put into the wheel last night with a track pump (I go over the 120 max because, no matter how quickly I disconnect the track pump, a tiny burst of air always gets out). So I'm guessing 125 maybe was in the tyre. As soon as I sit on the bike, which has been set up properly for fit, the back tyre looks only three quarters inflated, as in, my weight is squashing the tyre out a bit.

On my good bike, I have different wheels and tyres and those types take 160 psi now that I think of it, I usually but about 150 in the back and I've never had a problem. They seem to roll faster too (but comparison with Gatorskins isn't fair). Those tyres are some kind of Ridley own brand which I haven't seen for sale.

And finally yes, I got a pinch flat last night on a freshly pumped tyre (well 65 kms into the spin) and there wasn't a slow puncture prior to the pinch.

Thanks again.

I found something last night I think called schwalbe vlx tyres. 145psi they take.

lennymc

I was 115 kg at one stage, and put 120 psi in my 23mm tyres, and didnt have any issues using continental tyres.

wersal gummage

Viewing on a mobile phone here so hard to see, but that chart goes to 80kgs max? And requires about 150 psi in 25mm tyres at that weight??

That would be in line with what I'm experiencing. 120psi at 100kgs isn't enough at all.

lennymc

wersal gummage wrote: »

Viewing on a mobile phone here so hard to see, but that chart goes to 80kgs max? And requires about 150 psi in 25mm tyres at that weight??

That would be in line with what I'm experiencing. 120psi at 100kgs isn't enough at all.

that's the load per tyre afaik. so in your case assuming a 50/50 weight distribution you would be looking at 115 ish psi per tyre according to that chart.

the text below it assumes a 100 kg rider with a 45/55 split front to rear.

smacl

wersal gummage wrote: »

Viewing on a mobile phone here so hard to see, but that chart goes to 80kgs max? And requires about 150 psi in 25mm tyres at that weight??

That would be in line with what I'm experiencing. 120psi at 100kgs isn't enough at all.

That's per tyre, where your body weight is distributed between front and back, with typically more to the back. The ratio is based on your position on the bike, and the gradient you're cycling on.

ZiabR

That is per tyre OP. As you are running 2 tyres you should be aiming for a split between the two. Maybe 60/40 or 70/30 in extreme cases.

I would imagine running a single rear tyre at 130psi-150psi would result in more punctures. You would only have to graze a pot hole for the tube to pop.

I run 100-105psi in my front and 110psi in my rear. Never had a problem.