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Old 03-13-20, 01:14 PM
  #26  
Wilfred Laurier
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Originally Posted by Russ Roth View Post
I have seen the studies where this is true comparing 23 vs 25 and 28 though most seemed to find that while 28 had an advantage the difference in resistance between a 28 and 25 wasn't as great as the difference between 23 and 25 and was becoming a case of diminishing returns. I've yet to see one that claims a 32 or 35 has a smaller contact patch then a 23 or 28 and I suspect that's for a reason. I assume that once you get past a certain point the sidewall has to be stiffer tomaintain the shape of the larger casing and weight eliminates any advantage in any situation. Even for light tires the difference between 23 and 25 can be several ounces per tire.

Wouldn't have thought it would be that big a difference but it seems it might be.
makes sense.

Anyhow, the 'rolling resistance' is a small part of the equation - a tiny fraction of the resistance of pushing your body through the air at 30 km/h.
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Old 03-13-20, 10:35 PM
  #27  
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Originally Posted by Wilfred Laurier View Post
This is not true. 'Rolling resistance', the energy lost to tire casing flex as you ride, is less for wider tires, if comparing otherwise identical tires.
It is not exactly true. It is less for wider tires AT THE SAME PRESSURE but wider tires AT THE SAME PRESSURE will not be any more comfortable, and if you reduce the pressure then your rolling resistance benefit is lost - unlike tire weight penalty.
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Old 03-15-20, 09:21 AM
  #28  
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Well the weather looks like it may cooperate so back on the bike,I did order a set of mavic ksyrium sl off ebay should get them this week,I checked out some brake post extenders,I will make photo once I get it together,thanks all for the advice,I used all of it,I could not have done this on my own,thanks
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Old 05-30-20, 03:25 PM
  #29  
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Originally Posted by Oso Polar View Post
It is not exactly true. It is less for wider tires AT THE SAME PRESSURE but wider tires AT THE SAME PRESSURE will not be any more comfortable, and if you reduce the pressure then your rolling resistance benefit is lost - unlike tire weight penalty.
Sorry to dig up a zombie thread, but you are mistaken.

Wider tires at the same pressure as narrower tires will deflect more easily because of the larger volume of air inside the tire, so will be marginally more comfortable.
And since wider tires at the same pressure have less rolling resistance than tires that are narrower but otherwise identical, you can lower the pressure and get the same rolling resistance as the narrower tires and have noticeably more comfortable ride.

Please not that I am not saying wider tires are necessarily faster, but that they have less rolling resistance, which is a small component of the overall drag you must overcome when riding, especially when speeds go up. The aerodynamic resistance of the fatter tire cutting through the air will probably claw back any advantages of lower rolling resistance if you are riding over 30km/hr or so. You still get the additional comfort and traction and pinch-flat and rim damage protection, but the bike will be a bit slower.
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Old 05-30-20, 06:55 PM
  #30  
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559 - 40 tires should be just right for commuting (26x1.5") a tire that is "fast" will trade away puncture resistance..
your velocity mending a puncture will be Zero..
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Old 05-31-20, 11:17 AM
  #31  
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I actually prefer a high-volume tire, like 1.95-2.1 on my commuter bike, especially since that kind of riding typically involves lots of surface transitions. Based on RWGPS data, my primary commuter, a 26 former XC racer, gave up only 0.5 mph moving average to the 700c (28 and 32mm) road bikes, despite having a max speed 2-3mph lower; the bigger tires meant that I didnt have to slow down as much.
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Old 05-31-20, 11:44 AM
  #32  
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I agree you just have to find the tires that are made for good speed on 26 inch wheels. I replaced my road tires with super heavy duty flat resistant knobbies and now I really regret that lol
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Old 06-04-20, 10:00 AM
  #33  
Oso Polar
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Originally Posted by ClydeClydeson View Post
Sorry to dig up a zombie thread, but you are mistaken.
Wider tires at the same pressure as narrower tires will deflect more easily because of the larger volume of air inside the tire, so will be marginally more comfortable.
Nope, you are. You can easily confirm that you are wrong yourself - take two tires of a very different size, say, 28 mm tire and 42 mm tire (of a similar "supple" type), pump both to the same pressure, say, 60 psi. Now, squeeze tires with your own fingers. Which tire will be much softer (="deflect more easily")? The ride feel will reflect this - 28 mm at 60 psi will probably feel too soft (or just right - depending on your + bike weight), 42 mm at 60 psi will result in anextremely harsh ride - unless you are seriously overweight. To get a softer ride from wider tires they must be run at lower pressure.
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Old 06-04-20, 10:07 AM
  #34  
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Originally Posted by Oneder View Post
I agree you just have to find the tires that are made for good speed on 26 inch wheels.
I have Continental Sport Contact II on my bike with 26 inch wheels, they seem to be pretty fast. AFAIK they are not manufactured anymore and were replaced by Contact Speed (https://www.continental-tires.com/bi.../contact-speed). Looks exactly the same on photos.
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Old 06-11-20, 09:55 PM
  #35  
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28 inch tires. Is there such a thing?

A woman wanted to buy my Raleigh Sport but her husband said no, he wanted something with 28 inch tires. Do they exist?
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