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PostPosted: Mon Nov 23, 2015 8:34 am 
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Joined: Tue Jan 13, 2015 10:48 am
Posts: 14
ever since i made the switch from 23mm to 25mm about a year ago, my flat & rolling speed have improved but climbing have suffered. not very sure if its the tires or the few kilos i've gained so would like to hear it from fellow climbers out there. i'll stick to 25mm's for my aero bike with aero wheelset but i have another climbing bike with climbing wheelset and would like to maximize its potentials


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PostPosted: Mon Nov 23, 2015 12:26 pm 
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in the industry

Joined: Sat May 12, 2012 7:25 pm
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Location: Glermsford, Suffolk U.K
It's the few kilo's you have gained.

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PostPosted: Mon Nov 23, 2015 5:28 pm 
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Posts: 5369
Location: Athens, Greece
that

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PostPosted: Tue Nov 24, 2015 12:25 am 
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Joined: Mon Nov 23, 2015 6:35 am
Posts: 6
Kilos for sure....


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PostPosted: Tue Nov 24, 2015 5:34 am 
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Joined: Thu Sep 05, 2013 3:29 pm
Posts: 218
Probably the kilos, but I have wondered what, if any, effect, a lower pressure mushier tire has on power transfer. What kind of pressures were you running in the 23mm vs. 25mm? I have noticed that with my 28mm tires at about 20psi less than I would run in a 23mm, you can really feel them squishing during hard standing climbing efforts when the bike sways side to side. There could be effects on the wheels ability to transmit force to the ground, but more so I am thinking of the deflection perhaps reducing the ability to put force into the pedal. Not saying anything for certain, but if you are someone who thinks that frame/crank/wheel flex can compromise power transfer then the same principals apply. Now having said all of that...there is a long and fairly recent thread on the frame stiffness altering power transfer question and the general conclusion was clear as mud, so good luck getting data on this one!

BTW, you said climbing speed suffered. How much did it suffer and how are you measuring it?


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PostPosted: Tue Nov 24, 2015 2:18 pm 
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Joined: Wed Jan 22, 2014 11:48 am
Posts: 1473
TheKaiser wrote:
if you are someone who thinks that frame/crank/wheel flex can compromise power transfer then


... you are probably wrong ;)

Tire pressure does affect rolling resistance, but wider tires are harder / resist compression better at identical pressure compared to narrower tires. Most or all of the reported lower rolling resistance of wider tires is due to this fact, and is lost when they are pumped to provide the same level of comfort as the narrower rubber.


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PostPosted: Tue Nov 24, 2015 3:36 pm 
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Joined: Sun Jan 26, 2014 3:44 am
Posts: 314
LOL, it is the kgs. 23mm to 25mm will make sod all difference in the real world. If you are noticing a difference in your climbing speed and you have gained weight, that is the reason.


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PostPosted: Tue Nov 24, 2015 3:37 pm 
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Location: Athens, Greece
Or just a bad day...

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PostPosted: Wed Nov 25, 2015 3:51 pm 
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Posts: 630
Location: Florida
Too many Warsteiners. Suffer more and drink less beer or just suffer more.


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PostPosted: Wed Nov 25, 2015 9:15 pm 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 2192
Location: Santa Cruz, California, USA
If you went from a 23mm tire with very low rolling resistance to a 25mm tire with lousy rolling resistance, you might notice a difference. From memory its about 10w per tire from the lowest to the highest resistance reasonable race tire.

If the tires are the same brand and model they are probably very close in rolling resistnce. And in fact the 25mm might be lower than the 23. They often are. In that case it's the body weight, winter, bad day, etc.


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PostPosted: Fri Nov 27, 2015 7:01 pm 
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in the industry

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Location: Glermsford, Suffolk U.K
you're trying to get your starbike discount aren't you?

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PostPosted: Thu Dec 03, 2015 2:12 pm 
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Joined: Sun Nov 03, 2013 3:13 am
Posts: 73
Not sure what your exact setup is but I prefer the feel of a 23mm tire over a 25mm given the same brand. My bike just feels faster with better steering response in comparison.


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PostPosted: Thu Dec 03, 2015 2:33 pm 
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Joined: Sat Dec 07, 2013 10:15 pm
Posts: 539
The width of a nickel is 1.95 mm. Not likely such a trivial change would impact your speed. Most likely psychological , training related or even weather related.

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