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zmjones_

Member since Mar 2017 • Last active Apr 2019
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  • 162 comments

seattle, wa

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  • in Bikes & Bits
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    yea ofc. not disagreeing with bigger is less aero all else equal. i just think it is a relatively small difference outweighed by what it buys you.

    maybe i misunderstood you. i was merely disagreeing with the notion that wider means more crr. the advantage is not bottoming out, better traction, less risk of flatting. but you already know all of that.

    and sure. we can rehash this in a few years then :D. someone ran the 30mm tubeless s-one at roubaix a few years ago didn't they?

  • in Bikes & Bits
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    oh are they? you said they were 29mm rims. if that is the case then my point isi more invalid.

    obviously wheel aerodynamics are much more complicated than frontal area. obviously nobody runs 20mm tires anymore...

    and no that isn't right about crr. the link i put in my last post shows this with the gp5000. if you inflate to the same tire drop, or casing tension, and the tires are made of the same compound, the crr is the same.

    yea maybe mvdp wouldn't have pinch flatted in the first place, or maybe he'd of retained a more rideable pressure.

    i watched the footage a few times and couldn't see really what took him down, and different news outlets have all said different things. his wheel was not in line with his bars when he hit the ground though, so idk what is going on.

  • in Bikes & Bits
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    the aerodynamics rule is rim must be > 1.05 of carcass width. as far as i know the only aero rim for 30mm tubs is the enve 4.5 ar disc. so i don't think there is much difference.

    the crr for a wider tire with the same compound is basically the same for the same casing tension. https://www.bicyclerollingresistance.com­/specials/grand-prix-5000-comparison

    in any case not bottoming out would massively reduce your probability of flatting. not like they are putting sealant in tubs either.

    skeptical of the idea that the "rideability" of a flat tub is really that important. you can't ride very well. e.g., mvdp's flat at de ronde. but maybe i'm wrong.

  • in Bikes & Bits
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    i mean there isn't much aero benefit when you are above 1.05 of rim width right? these guys are already running 28 or 30mm tubs on rims designed for 23 or 25mm tires.

    idk i'd guess they were much less likely to puncture. i've only rarely had tubeless punctures that didn't retain a rideable amount of pressure. seems like not having the tire come off the rim is a pretty low standard. with 50mm you wouldn't be bottoming out at all.

  • in Bikes & Bits
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    i mean wouldn't much larger tubeless tires be the real winner here? i bet a 650b 50mm tire would be considerably faster than what they run.

  • in Bikes & Bits
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    curious why? i'm a tiny bit long in the torso and short in the legs and ride a tcr. haven't tried an ultimate though.

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