Tyre Pressures - Conti Gatorskins 700x23c

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dee4life2005
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Tyre Pressures - Conti Gatorskins 700x23c

Postby dee4life2005 » Sat Nov 10, 2012 17:01 pm

Up until just over 1 week ago, I'd done around 1500 miles since fitting the Conti Gatorskins to my road bike and hadn't had any issues, but in the last week I've now had two punctures - both of which were pinch flats as evidenced by the "snakebite" holes in the tubes.

I have been running 100psi for both front and rear, but with all the crap on the road from tractors etc. I'm starting to think that this might be a little on the low side and may be why I've had a couple of pinch flats - can't remember catching any potholes or the like.

I'm 165lbs (75kg), and the gatorskins (700x23c) are rated to 120psi. What are other people running in their tyres ... I seem to recall reading a chart based on weight but I can't seem to find it anywhere.

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nweststeyn
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby nweststeyn » Sat Nov 10, 2012 17:14 pm

110 front 115 rear - but I check them before every ride

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JimBobs09
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby JimBobs09 » Sat Nov 10, 2012 17:40 pm

Hi

I also use Gatorskins, but I use the 25mm tyre. I keep mine at just over 100psi and have not had any problems for the few months i've been using them.

I weigh just under 13 stone.

priory
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby priory » Sat Nov 10, 2012 17:51 pm

pinch flat at 100psi sounds extremely unlikely to me.
if a week passed between pump and flat then maybe pressure was down to 70, particularly if the tube and valve are getting old. if the tube or valve has a slow leak the the tyre could go soft while you're on a ride and finish with a pinch flat.
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Frank the tank
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby Frank the tank » Sat Nov 10, 2012 18:02 pm

Haven't weighed myself lately but I'm about 72Kg-70Kg and run ultragator skins at 8bar (116psi) Could be tempting providence but I've not had a problem with 'em. Could be 1,500miles is getting toward the end of its life.
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dee4life2005
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby dee4life2005 » Sat Nov 10, 2012 18:11 pm

Seems like I'm a little light on the pressure then ... I`ll try upping it a bit see if it helps, as changing a puncture in temperatures < 5c is not my idea of a fun ride.

The rear tyre, the one that punctured, was inflated to 100psi last night ... I didn't check it this morning before setting off though as was in a bit of a rush. It was a continental tube with a removable core, so perhaps some air was leaking out from the valve ... It was a new tube that I fitted after the pinch flat I had 7 days ago. The tyre is definitely still okay, as it's nowhere near the wear indicators - assuming that's what these two small circular "dips" in the slick part of the tread are for.

stiffupperlip
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby stiffupperlip » Sat Nov 10, 2012 18:14 pm

I run front 110, back 120, -10 for wet/leafy roads. Never had a snakebite but last week had an inside puncture at the back due to old rim-tape allowing the tube to blister into spoke hole - are you sure your tape is OK? I'd done c2500m on mine before changing it.

145lbs, c8-10 punctures on my Gatorskins in 2500m (nearly all flint/thorns).

dee4life2005
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby dee4life2005 » Sat Nov 10, 2012 18:26 pm

good point about the rim tape ... didn't think to check that. Might take the tyre off tomorrow and have a quick look.
ta.

99thmonkey
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby 99thmonkey » Sat Nov 10, 2012 19:41 pm

Id have the tyres off and check the rim edge plus the tape for any debris or purtruding spokes / metal

tiredofwhiners
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby tiredofwhiners » Sat Nov 10, 2012 20:07 pm

Frank the tank wrote:Could be 1,500miles is getting toward the end of its life.


Not likely IMO - tyres will last well beyond that as long as they don;t get a slash in them. I've had Gatorskins last maybe 7,000 miles until they worse through.

I always check my tyre pressures before every ride and its rare that either if them don't need a little more air. I've found that inner tubes with removable cores tend to start to leak a bit even if the inner is sound.

notlongnow
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby notlongnow » Sat Nov 10, 2012 20:13 pm

110 back 100 front and I check em every 2 days

Lookyhere
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby Lookyhere » Sat Nov 10, 2012 21:32 pm

Im doing something wrong here :) i ride some of the shitiest potholed hedge trimmed lanes Cornwall and W.Devon have to offer, have never had a pinch puncture using Gatorskins and run about 85 to 90 psi - @ 78kg, how you guys manage 115psi is beyond me but each to their own.
I do about 7000miles a year on either these or Gp4000s and tempting fate here, have had about 2 or 3 punctures in the last 5 years and only one of those was on a Conti, the other 2 being a Vittoria Pave and a Pro3.

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wilo13
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby wilo13 » Sat Nov 10, 2012 21:59 pm

priory wrote:pinch flat at 100psi sounds extremely unlikely to me.
if a week passed between pump and flat then maybe pressure was down to 70, particularly if the tube and valve are getting old. if the tube or valve has a slow leak the the tyre could go soft while you're on a ride and finish with a pinch flat.


This is very true, the chance of getting a pinch flat at 100psi at your weight is minimal. Its more likely due to badly fitted rim tape.
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drlodge
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby drlodge » Mon Nov 12, 2012 10:21 am

I run 110 rear, 95 front, although yesterday I didn't pump up/check my tyres so they were a little lower than that and actually quite a bit more comfy. Probably around 105/90. I'm 12 stone.

I've had one puncture on these tyres, which was a pinch flat on the front, I went over a stone straight on at about 30mph.
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ALIHISGREAT
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby ALIHISGREAT » Mon Nov 12, 2012 10:28 am

priory wrote:pinch flat at 100psi sounds extremely unlikely to me.
if a week passed between pump and flat then maybe pressure was down to 70, particularly if the tube and valve are getting old. if the tube or valve has a slow leak the the tyre could go soft while you're on a ride and finish with a pinch flat.


this.

At 75kg you shouldn't be having pinch flats at 100psi unless you're hitting lots of potholes hard.

It is worth noting the influence of temperature on tyre pressure -> if you're pumping your tyres up indoors at ~20 degrees Celsius.. then going out and riding at 5 degrees Celsius there is going to be some loss in pressure due to the air contracting at the lower temperature. (around 6psi for that temperature gap I think).

Since I keep my indoors I put in 110-115psi to the rear, accounting for a fall to 100-110psi due to temperature differential.

cougie
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby cougie » Mon Nov 12, 2012 12:40 pm

Exactly - you can't be pinching them at that pressure.

I'm heavier than you and I run mine about 90-95. Thats what a conti mechanic advised me - and it works. I'd not want to be riding rock hard tyres with all the slippery stuff around.

DavidJB
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Re: Tyre Pressures - Conti Gatorskins 700x23c

Postby DavidJB » Mon Nov 12, 2012 12:57 pm

I run my tyres at no less than 234PSI.


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