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Mavic A319 owners...how small a tire could I go?

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Mavic A319 owners...how small a tire could I go?

Old 02-03-11, 11:11 PM
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delilo
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Mavic A319 owners...how small a tire could I go?

Specs for the Mavic a319 rim says tire widths of 28c to 47c are acceptable.
Could I run a 25c tire?
What would happen?
Thanks.
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Old 02-03-11, 11:15 PM
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I've run 700c x 25 Continental Gatorskins on 319 and 719 rims at 120psi for years without a problem. These days I run either 25's or 28's depending what's on special the day I buy a tire.
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Old 02-03-11, 11:29 PM
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Originally Posted by delilo View Post
Specs for the Mavic a319 rim says tire widths of 28c to 47c are acceptable.
Could I run a 25c tire?
What would happen?
Thanks.
you reduce the amount of tire that can protect the rim from damage when riding over bumps/holes. Think of it this way, if you're riding along and hit a rock or piece of loose concrete on the side of the tire. When the tire is wider than the rim it can compress a bit without hitting the rim. As the tire gets smaller the distance it can compress is less and you have to maintain a higher pressure. So sure you could put a narrow tire on there but there's a reason people race on 19-20mm wide rims and not 25mm wide rims. It begs the question what you are trying to get with a 25mm tires.
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Old 02-03-11, 11:43 PM
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Originally Posted by LeeG View Post
you reduce the amount of tire that can protect the rim from damage when riding over bumps/holes. Think of it this way, if you're riding along and hit a rock or piece of loose concrete on the side of the tire. When the tire is wider than the rim it can compress a bit without hitting the rim. As the tire gets smaller the distance it can compress is less and you have to maintain a higher pressure. So sure you could put a narrow tire on there but there's a reason people race on 19-20mm wide rims and not 25mm wide rims. It begs the question what you are trying to get with a 25mm tires.
I did thousands of miles on 25's and 28's on 319 and 719 rims. No practical difference in terms of rim protection. They're actually pretty tough rims and you're going to pinch flat on either size long before you do any damage to the rim. A solid enough hit to damage the rim will cause damage irrespective of the tire size (I know, I've damaged/destroyed several 319's over the years). There is however a noticeable handling and acceleration difference as you go larger with tires. I found a decent quality 25 to be perceptibly 'sportier' than a 28 which in turn is better than a 32. I don't mind compromising with a 28 as it is a smoother ride than a 25, but I hate going bigger than 28.
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Old 02-04-11, 12:02 AM
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Originally Posted by Cyclaholic View Post
I found a decent quality 25 to be perceptibly 'sportier' than a 28 which in turn is better than a 32. I don't mind compromising with a 28 as it is a smoother ride than a 25, but I hate going bigger than 28.
just think how sporty that 25mm tire will be on a rim that weighs 100-150grams less and is 5mm narrower. If a person wants narrow light tires it's kind of silly to put them on wide heavy rims when there's no advantage and some disadvantage. If the goal is fast riding the last thing I'd want while leaning over taking a tight turn is the metal rim closer to the pavement. With a more rounded tire you've got a bit more chance of keeping rubber on the road when hitting bumps. There's a reason people race on 19-20mm wide rims with 23mm tires and not 25mm wide rims with 25mm tires.
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Old 02-04-11, 12:22 AM
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Originally Posted by LeeG View Post
just think how sporty that 25mm tire will be on a rim that weighs 100-150grams less and is 5mm narrower. If a person wants narrow light tires it's kind of silly to put them on wide heavy rims when there's no advantage and some disadvantage. If the goal is fast riding the last thing I'd want while leaning over taking a tight turn is the metal rim closer to the pavement. With a more rounded tire you've got a bit more chance of keeping rubber on the road when hitting bumps. There's a reason people race on 19-20mm wide rims with 23mm tires and not 25mm wide rims with 25mm tires.
Yeah, for sure. If the OP intends running 25's all the time and is in a position to choose a different rim then something like a cxp33 or open pro would be a much better choice. I suspect that he already has a 319 tho and just wants to try out a narrower tire.

I'm now riding a pair of Ksyrium Elites that I picked up for a song and the performance difference coming from a pair of 36-spoke 719 rimmed touring wheels was astounding.
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Old 02-04-11, 12:33 AM
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Originally Posted by Cyclaholic View Post
I found a decent quality 25 to be perceptibly 'sportier' than a 28 which in turn is better than a 32. I don't mind compromising with a 28 as it is a smoother ride than a 25, but I hate going bigger than 28.
Are you comparing tires of the same type? I just got a pair of 700x28 Grand Prix 4 Seasons, and they're pretty darn sporty. It occurs to me that there just aren't many 'built for speed' tires available in wider sizes.
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Old 02-04-11, 01:23 AM
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Originally Posted by Andy_K View Post
Are you comparing tires of the same type? I just got a pair of 700x28 Grand Prix 4 Seasons, and they're pretty darn sporty. It occurs to me that there just aren't many 'built for speed' tires available in wider sizes.
Yes, as far as availability of sizes allows. The GP4Seasons is an excellent tire.
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Old 02-04-11, 01:34 AM
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Runnhing 25's on a 319 is not going to cause any issues... it is only 3mm narrower than the narrowest advised size and one has to know that the posted size of tyres is often different than what they actually run out at.

The difference is speed between a 28 and a 25 is going to be caused more by differences in the tyre than anything else.
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Old 02-04-11, 10:40 AM
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i run 23's (schwalbe durano plus) on my a319 front wheel. it's not ideal, but it is functional. i found a shimano dynohub laced to this wheel for a good deal. and it was only suppose to be temporary. i have yet to blow up, melt, combust or be gifted a flat of any kind on that wheel after almost 1300 miles. granted, i'm only commuting and doing brevets. no major loads up front.
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Old 02-04-11, 10:48 AM
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You guys must commute on much better roads/trails than I did. I was usually looking for slightly bigger tires, 700x32c to 700x37c, to keep from beating myself up or damaging rims. I also weighed over 250 lbs.
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Old 02-04-11, 01:33 PM
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I run 32c most of the time, 90% of my miles are commuter.
I did some double century rides on 28c tires last year.
Merely a hypothectical -- just wondering if I wanted to run 25c for a century ride, or a go-fast longer ride, if I should look for a different rim.
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