Tire pressure for D2R2
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  1. #1
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    Tire pressure for D2R2

    I'm doing the 180k D2R2 this weekend and still playing with tire pressure. I weigh 190lbs and using Clement MSO 40mm (120tpi) tires. Been running them 75psi front and rear, which might be a tad high but worried about pinch flats Suggestions?

    Thanks

  2. #2
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    I'd use 40 as a starting point and go from there. 75 on a 40mm tires is punitive.

  3. #3
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    I know next to nothing about the D2R2 but I've put around 2500 miles on a set of Clement MSO 40mm tires. I ride mostly gravel mountain roads with a bit of stony double track.

    I weight 170-175 and on gravel/dirt roads I like the pressure to be around 45-50 lbs. I've never had a flat (pinch or otherwise) with those tires and there have been times when I neglected to check the pressure for a while and found them to be down in the 25-30 lb range.

    I'm using them on a Salsa Vaya and I consider myself a "light rider".

    hth

    SalsaVaya.jpg

  4. #4
    'brifter' is f'ing stupid
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    75?!? They must be hard as a rock. Don't inflate your tires so you won't pinch flat, they'll always be too hard. Inflate to a pressure that gives you the ride quality and traction you want for the 99.99% of the time you're not pinch flatting. On a 40mm tire you'd pretty much have to close your eyes and run into a lunar crater to pinch flat. I'd be running those at 40-45.
    #promechaniclife

  5. #5
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    Granted I'm lighter than you but I've never known pinch-flatting to be an issue on gravel roads such as those at D2r2 and I ride them frequently with just regular 25mm road tires (Vit Pave, mostly). It generally takes a sharp edge like railroad tracks or the edge of a pot hole to cause a pinch flat.
    Than again, you do see a ton of people with flats on that ride so maybe I'm wrong but I'm under the impression that a lot of those flats are from sidewall cuts caused by sharp rocks. (bring a few boots by the way)

    I'm 50 pounds lighter than you and my only experience with 30mm tires is commuting so take it with a grain of salt but I'd mostly likely go 50 psi or so with 30mm tires for that ride and have 0 concern over pinch flatting.

  6. #6
    wheelbuilder
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    Quote Originally Posted by Jay Strongbow View Post
    Granted I'm lighter than you but I've never known pinch-flatting to be an issue on gravel roads such as those at D2r2
    Oh, it's a thing. Happened to me a couple times which is why I prefer tubulars or a tubeless setup for those rides. The only clinchers I would bring back to a long gravel ride like that would be 42mm 650b. That's enough rubber to put pinch flats to bed. I've pinched Michelin Jets before when I only put 40psi in them.

  7. #7
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    Quote Originally Posted by ergott View Post
    Oh, it's a thing. Happened to me a couple times which is why I prefer tubulars or a tubeless setup for those rides. The only clinchers I would bring back to a long gravel ride like that would be 42mm 650b. That's enough rubber to put pinch flats to bed. I've pinched Michelin Jets before when I only put 40psi in them.
    I've never had a pinch flat in thousands of miles on gravel with regular road tires but if others have been known to I'll stand corrected on saying pinch flatting isn't a big concern. Perhaps weighting 140ish does more to avoid pinch flats compared to many others than I give it credit for.

  8. #8
    wheelbuilder
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    Quote Originally Posted by Jay Strongbow View Post
    Perhaps weighting 140ish does more to avoid pinch flats compared to many others than I give it credit for.
    Um, heck yeah it does! I have ridden dirt ranging from 160-180lbs.

    You also know that not all gravel is created equal. Some of those roads have 2-3" rocks strewn about when freshly graded. Even a good rain will completely change the road surface (usually for the better). Washboard descents are notorious for pinch flat causing.

  9. #9
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    Last year I rode Conti Cyclocross Speed tires(700 x 35) on the D2R2. I ran latex tubes with @45 psi with no flats. I'm only @150lbs fully loaded. I rode with someone for a while on a road bike with 25c gatorskins. That was impressive. Some of the gravel downhills would be sketchy for me on those, but he was a local.

  10. #10
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    I start my spring rides at 50psi in a 35mm clement rear but @ 185-190lbs I've never had a pinch [fingers crossed] flat even running it as low as 38... I'd say start at 50 if you intentionally hit sharp curbs and holes... 47 is probably a better starting number for [our] weight.

    I don't have a specific gauge so I just use the pump mounted one. I've heard they aren't as accurate as a bike specific pressure gauge, but as long as I'm basing the pressure of the same pump, I don't worry about actual accuracy.
    The internet is a little like a bar, a wonderful place where we can bullsh(t our past, but it also, is full of reasonably reliable sources of information to be used as ammo to call "bullish)t."

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