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Discussion Starter · #1 ·
I just recently purchased a 2010 Specialized P1 A.M. and love it! Can anyone offer me some direction on what size tubes to buy? Factory were (26x1.5/2.2) on Pricepoint they have (26x1.9/2.125) or (26x2.25/2.5). Also are there any advantages to going with a "Presta" type valve? Thank You!
 

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Sneaker man
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1 depends on how you rims are drilled, if you have schrader (car valve) then you can run whatever, if you have presta, then more than likely you will have to run presta as the rim hole will be to small.


and probbly the 1.9 the go... unless you run fat tryes...
 

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Can't feel my legs
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If the tires are stock, I'm guessing (26x1.9/2.125) is what you need. Yes, Presta is better IMO.
 

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Discussion Starter · #4 ·
Well my tires are the stock Specialized meats. They're pretty fat, and originally came with schraeders so I can switch over. But i'm trying to figure if it would be worth it to make the switch because i'd have to purchase a Presta pump.. Thanks for the quick responses guys!
 

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Can't feel my legs
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Just check the tire size, pretty sure they are 2.10 and would accept the (26x1.9/2.125) tubes. If you plan on staying in the hobby, then yes, it would be worth it to purchase a pump and go with Presta.
 

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Specialized 2.1 tires are rather like 2.3 of most manufacturers. Besides, P1 is a bike for pretty aggressive riding. So I'd go for larger tubes,
I can't see why run Presta, if you already have Schraeder ready rims. Many riders (me included) even drill Presta rims to accommodate Schraeder, that make less problems, particularly if you are going to fill the tubes with sealant.
 

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I doesn't matter too much...

Tube size doesn't really matter too much. They stretch to match your tire size. The main thing to keep in mind is that the smaller the tube vs. the larger the tire; the thinner the rubber gets. I've run 1.9 tubes in 2.4 tires without issue.

Presta v Schrader: It doesn't matter one bit. I'd just run what my wheels are drilled for.
 

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Can't feel my legs
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Ken in KC said:
Tube size doesn't really matter too much. They stretch to match your tire size. The main thing to keep in mind is that the smaller the tube vs. the larger the tire; the thinner the rubber gets. I've run 1.9 tubes in 2.4 tires without issue.

Presta v Schrader: It doesn't matter one bit. I'd just run what my wheels are drilled for.
Tube size can matter if the tube is too large, which is why I recomend the correct tube for his tire.
The reason I prefer Presta over Schrader is that they allow for quicker/easier trailside repair. Can't really think of any advantages to Schrader.
 

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Correct

JPark said:
Tube size can matter if the tube is too large, which is why I recomend the correct tube for his tire.
The reason I prefer Presta over Schrader is that they allow for quicker/easier trailside repair. Can't really think of any advantages to Schrader.
The expanded tube would have to be larger than the internal volume of the tire. And if you're running a 1.8 tire, the likelyhood of you spending extra money for an oversized tube vs. say a 2.2-2.5 isn't that likely. Possible for sure but unlikely.
 

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Stock tires on that bike are 26x2.2 Schraeder. I would buy the 26x1.5/2.2 Schraeder valve tubes. There's not really a huge benefit between Schraeder/Presta, IMO, and sticking with Schraeder should result in less headaches for you as you install the tubes, fill them, etc.
 

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Discussion Starter · #11 ·
Thanks guys!! I'll get some of the Shraeder's then. 1.5-2.2!
 

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Im sure everyone has done the "inflate the tube till it bursts" before. I was quite impressed how far they could stretch. We inflated a 1.95-2.125 to about 10" before it burst, was interesting to see. After that my cousin runs standard 1.95-2.125 in his 2.3 tires and I still run 2.0-2.2 I think it is in my specialized 2.3.
 

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So a tube that's sized for up to 2.125 would inflate a 2.20-2.25 tire with no problem? Would you have potential problems if you were running mildly low pressure? I've been wondering about that.. I'm using the 5x as thick Slime tubes after getting flats. heavy but no problems. I'm guessing a large DH tube like Kenda is as heavy or heavier than the Slime 5X Smart tubes?
 
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