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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 08-16-12, 06:12 AM   #1
evand
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Tire pressure on 25 tires what are you guys running??

I just put on a set of vittoria zaffrio pro II tires size 25. I am wondering what you guys recommend for tire pressure. I was thinking 130ish. I am 265. I was using vittoria randonneur size 28 which were perfect at 90psi


I am looking for a little more speed for my century ride this sat.
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Old 08-16-12, 06:42 AM   #2
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I use to run at 120 but lately I have dropped that to closer to 100 in the rear and 90-95 in the front and like the handling and ride a lot better.

I doubt your tire is even rated any higher than 120
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Old 08-16-12, 07:01 AM   #3
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I have a Schwalbe Durano Plus 25 on my rear for every day riding. I run it between 110-120 depending on the roads, and weather conditions.

Usually i keep it around 115+, and usually only go to 120 (the limit of the recommended pressure) when i know its a smooth freshly paved route. Otherwise the ride is very harsh, especially over the chip sealed North West roads.
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Old 08-16-12, 07:16 AM   #4
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230 lbs. GP4000s. 210psi.
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Old 08-16-12, 07:44 AM   #5
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230 lbs. GP4000s. 210psi.
210psi?
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Old 08-16-12, 07:46 AM   #6
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A bit under 250, 120 front, 135 rear on Panaracer Type-D's.
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Old 08-16-12, 08:04 AM   #7
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I use to run at 120 but lately I have dropped that to closer to 100 in the rear and 90-95 in the front and like the handling and ride a lot better.

I doubt your tire is even rated any higher than 120
+1
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Old 08-16-12, 08:14 AM   #8
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Double check the max pressure rating on the tire. I use Continental GP4000 and they're rated at 120psi max. Sure there are tolerances, and chances are there will be no issues going a little above the max rated pressure, but why running chances?
I ran 120 back 110 front at 200+#. I could have gotten away with a bit less pressure but higher pressure pretty much barred pinch flats from my riding. I honestly did not feel any change in comfort with 10 psi pressure difference (i ride now 110 back and 100 front).
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Old 08-16-12, 08:19 AM   #9
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As high as the sidewall says I can go. Slightly less in the front.
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Old 08-16-12, 09:19 AM   #10
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As high as the sidewall says I can go. Slightly less in the front.

Be careful doing this if you're using really high pressure clincher tires like Vredestein, or Vittoria and don't know what the max pressure your wheel can withstand. Mavic for example has a max pressure of 138(23mm), 131(25mm) and 117(28mm), the new aluminum Zipp 101 is only 125psi, both of the tires I mentioned have recommended max pressures above these limits(140 and 200psi respectively).

Disclaimer: This post was cut and pasted from a post I made in another thread months back because I didn't feel like retyping.
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Old 08-16-12, 09:23 AM   #11
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Be careful doing this if you're using really high pressure clincher tires like Vredestein, or Vittoria and don't know what the max pressure your wheel can withstand. Mavic for example has a max pressure of 138(23mm), 131(25mm) and 117(28mm), the new aluminum Zipp 101 is only 125psi, both of the tires I mentioned have recommended max pressures above these limits(140 and 200psi respectively).

Disclaimer: This post was cut and pasted from a post I made in another thread months back because I didn't feel like retyping.
+1
The larger the tire, the more force it puts on the rim at the *same* pressure. After breaking the *second* new Mavic mtn rim, I learned that just because the sidewall of a tire says it can take pressure "X", does not mean the rim can take it.
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Old 08-16-12, 09:24 AM   #12
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I doubt your tire is even rated any higher than 120


My mental knowledge base would say you are wrong. But to prove it I searched for proof. I have seen several models that rate over 120. Vredstein comes to mind (friend rode them) as welll as a Continental model ( I want to say trubo but why look it up when I know I am right about the rating ). So I looked up Vredstein as well and the Fortezsa rates 115-175.

I myself wouldn't go beyond 120 but the rating "IS" higher than 120.



psi by gulpxtreme, on Flickr
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Old 08-16-12, 09:34 AM   #13
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205, running conti GP4000s 25s. 110 rear and 95 front. Amazing ride at those volumes, no pinch flats.

BTW, rim matters too. If you are running a wider rim you can lower pressure because there is more volume. I am not -- the above is on DT R585s.
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Old 08-16-12, 09:40 AM   #14
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+1
The larger the tire, the more force it puts on the rim at the *same* pressure. After breaking the *second* new Mavic mtn rim, I learned that just because the sidewall of a tire says it can take pressure "X", does not mean the rim can take it.

I have to +1 your +1 because that's another great example. 26 slicks, especially the ones around the 1-1.25" sizes can have max pressures around 100psi or higher. Bad news for rims that are designed for your typical mtb low pressure/high volume type tire. There are rims that can handle these type of pressures but don't take it for granted that the ones on your bike will be ok without doing your own research.
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Old 08-16-12, 09:55 AM   #15
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I just ride wider tires. 700x32 with 90 rear, 60-70 front.

Might move to some 700x37s when my current rubber wears out.
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Old 08-16-12, 09:59 AM   #16
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235 riding on 25mm Gatorskins. 110 front/120 rear, no problems and rides great.
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Old 08-16-12, 10:04 AM   #17
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230 lbs. GP4000s. 210psi.
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210psi?
210? 'Doh! Sorry. 110psi. My bad!
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Old 08-16-12, 10:34 AM   #18
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231#, Specialized Armadillo Elite 700x25, 110 psi rear 90-100 psi front, check pressure and top off about once a week and both are sometimes down as much as 20 psi. No flats in 3,000 miles of any type. Most of these miles has been on chipseal of varing age and sharpness as well as gravel and sandy shoulders and bike lanes.
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Old 08-16-12, 11:56 AM   #19
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Good article on tire pressure that is still cited by many: http://www.bikequarterly.com/images/TireDrop.pdf
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Old 08-16-12, 12:03 PM   #20
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Good article on tire pressure that is still cited by many: http://www.bikequarterly.com/images/TireDrop.pdf
Calculator based on it: http://www.dorkypantsr.us/bike-tire-...alculator.html
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Old 08-16-12, 12:27 PM   #21
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205 lbs., 700cx25, max is 120 psi but I'm running front and rear at 110 psi.
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Old 08-16-12, 04:53 PM   #22
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I run 115 - 120 psi in my Specialized Armadillo All Condition 700 x 25s and I weigh about 230# and the bike is a steel touring bike that comes in around 30# depending on the racks and options I have on it at any given time. I will be switching to 28mm when these wear out (which could be a while the way they are holding up). The Armadillos do have a harsher ride so going up a size is probably a good idea if comfort is important to you.
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Old 08-16-12, 05:38 PM   #23
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250lbs running 25mm Vittoria Rubino Pros (that I hate, by the way) at 110 front/120 rear. No pinch flats, but have had several flats on them. Most frequently in the wet. In contrast, only suffered one flat on previous Maxxis Re-fuses, before they wore out, and that was due to riding through a construction site.

I suspect that those rated pressures that Beanz found are a mis-print. I find it hard to believe they (Vittoria) would rate their 25's to the same pressure as their 23's. I know that in the Rubino Pro's you certainly loose ten psi or so when you go to the larger tire. I would trust the sidewall more than a web page.
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Old 08-16-12, 06:19 PM   #24
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250 lbs and I refuse to ride on 25s. Have to pump them up so hard that I get a harsh ride.
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Old 08-16-12, 06:21 PM   #25
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250 lbs and I refuse to ride on 25s. Have to pump them up so hard that I get a harsh ride.

So, what are you using?
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