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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 06-12-09, 11:35 AM   #1
Alathea
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Tire pressuer rating different on site(s) than on tire

Okay, so now im confused. I know I can exceed the sidewall pressure a little bit, or not, but what if the sidewall pressure on the tire differs from the technical spec info listed for the same tire on 3 different merchant sites? These tires are rated on the sidewall for 60lbs at 26" x 1.75. That seems low to me-yet here are three different websites selling the same tire in the same size....with higher (75) psi's. Whats the deal? Any ideas?

https://www.universalcycles.com/shop...0&category=178 (70 psi)

http://www.amazon.com/CST-Selecta-Ti.../dp/B0013XZ5R6 (75 psi)

http://smartbikeparts.com/search_details.php?itm=TR3730 (75 psi )

Ive gone so far as to check the manufacturer's site to ask them if it is mis labled, but the email embedded on their website doesn't work.
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Old 06-12-09, 11:40 AM   #2
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go with the sidewall.
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Old 06-12-09, 12:21 PM   #3
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Is only 60 on a 1.75 normal? It seems low based on the rated sidewall of other 1.75 width tires, thats all.


Thanks!

CAS
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Old 06-12-09, 02:55 PM   #4
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I have some slick type 1.5's that say 30-80 psi on the sidewall, Specialized.

GO with the sidewall. Seems that would be more accurate than accessing their website!

60 maybe be the suggested psi. Most my 26.0 tire sidewalls suggest a range (eg 40-60 psi)
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Old 06-12-09, 05:36 PM   #5
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Is only 60 on a 1.75 normal? It seems low based on the rated sidewall of other 1.75 width tires, thats all.


Thanks!

CAS
Yup, my wifes bike has 65PSI on a 1,5 inch wide tire, my bike has 1.4 inch wide tires that are rated 85PSI..... It's possible to pick 5 tires of the same width and find that they are all different.
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Old 06-12-09, 08:36 PM   #6
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okie dokie. Ill go with that. Next time Ill go with different tires, I think.

Anyone got any feedback on why a floor pump reads 40 when I hookup and 60 after the first pump? Its a new pedros pump that I got today.
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Old 06-13-09, 04:50 AM   #7
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okie dokie. Ill go with that. Next time Ill go with different tires, I think.

Anyone got any feedback on why a floor pump reads 40 when I hookup and 60 after the first pump? Its a new pedros pump that I got today.
Not sure on the pump problem, I keep my tires at 85, and when I checked them last night I got 78 in one and 80 in the other, so a few pumps and they were fine.
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Old 06-13-09, 07:36 AM   #8
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Not so much a tire problem, just that the gauge on my brand new pump reads 40 when I hook it up, 3 different times on the same tire, that I tested with a handheld guage at around 60. I make one pump, and it jumps to about 60.

CAS
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Old 06-13-09, 01:11 PM   #9
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Not so much a tire problem, just that the gauge on my brand new pump reads 40 when I hook it up, 3 different times on the same tire, that I tested with a handheld guage at around 60. I make one pump, and it jumps to about 60.

CAS
I would take the pump back to the LBS, could be a faulty gauge, see if the other ones the dealer has do the same thing. Like I say, on my pump it gives the proper pressure right away, which is always slightly low because some of the pressure goes into the hose, lowering the over all pressure.
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Old 06-13-09, 06:57 PM   #10
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Be careful about higher pressure tires. Rims are also rated. I got a tire with 80 rating from stock 65 to increase my speed, and soon had spoke hole cracks. Found out that the rim was only rated to 65.
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Old 06-13-09, 08:33 PM   #11
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Where can I find the rim rating? I know what kind of rims are on it, but some googling hasn't led me to a chart anywhere. Weinmann 519's, 26"
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Old 06-13-09, 11:00 PM   #12
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I found my Mavic rating (after damage) on company website under product description, IIRC. If you can't find it, LBS should know for yours.
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Old 06-14-09, 05:48 AM   #13
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I found my Mavic rating (after damage) on company website under product description, IIRC. If you can't find it, LBS should know for yours.
There are two notes here though, on MTB rims, they are often rated for really wide tires, using a narrower but higher pressure tire is often okay. Rim pressure limits, like tire pressure limits are often less then what they are engineered for.
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Old 06-14-09, 07:53 AM   #14
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Don't get hung up on this stuff. You don't want a hard ride, so don't use more air than you need. A little bit of squishing is OK, and gives a nicer ride. You need more air on the rear than the front, and how much depends mostly on how much you weigh.

Basically I pump a tire up to the point where it stays round when I sit on it. Then I don't touch it for weeks. It's quite soft by the time I do it again. Like I said, nicer ride.
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