27mm or 25mm rim width, which is better?
Moderator: robbosmans
There's a reason why frame clearance is wider than ever on many 2017 models. The industry is pushing wide tires (e.g. 27mm+) for a damn good reason, and no, tire width is not overrated!
Racing is a three-dimensional high-speed chess game, involving hundreds of pieces on the board.
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mpulsiv wrote:The industry is pushing wide tires (e.g. 27mm+) for a damn good reason, and no, tire width is not overrated!
Did you post the wrong picture?
that picture explain what's good about wide rim. and show what's wrong with the tire too wide for the inner rim in sharp corner (not enough rim guidence support for the tire so tire can fold over it self and feel squishy with less control, exactly opposite of what people who go wider and lower pressure want from the tire.)
Last edited by Hexsense on Thu Nov 03, 2016 8:41 pm, edited 1 time in total.
Hexsense wrote:mpulsiv wrote:The industry is pushing wide tires (e.g. 27mm+) for a damn good reason, and no, tire width is not overrated!
Did you post the wrong picture?
cause that picture explain what's good about wide rim. and show what's wrong with the tire too wide for the inner rim.
The picture above illustrates the fundamentals of the footprint. Wide tires offer better grip, better rolling resistance and more comfort. These are solid reasons roll on wide tires.
Racing is a three-dimensional high-speed chess game, involving hundreds of pieces on the board.
CBA = Chronic Bike Addiction
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CBA = Chronic Bike Addiction OCD = Obsessive Cycling Disorderdannyboybad wrote:Is there a product out there like the Mavic CX01 blades for generic carbon clinchers/tubs that could help keep the air flow attached to the tyre / wheel.
I saw some pics of Contador's bike a year or 2 ago where his mechanic had filled in the groove between the tire and rim with silicone caulking to create a seamless transition. That should achieve a similar result to the Mavic blades I'd think. I'd like to see a rolling resistance test on both of them though, just to verify that they don't increase resistance through their contact with the tire casing as it deflects under load.
dannyboybad wrote:Hey....
Ive been looking to get a deeper section wheel set for racing from China... and I see a few new options they are pushing this year.
U shaped section and a wider rim... I see zipp 808's are 28mm wide now.
So what is better (faster)... 25mm or 27mm. See below latest offerings.
Thank you in advance for any advice.
https://www.aliexpress.com/item/ORGE-Ud ... 4f4c651aad
https://www.aliexpress.com/item/1730g-U ... 0.0.CCJJxP
Check out 3sixty5 cycling, is going to build wheel for you at a better price than if you buy parts from China.
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fromtrektocolnago
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Second the notion that it depends on the tire. Decide what tire width you plan on using and check the manufacturer specs for rims that support that tire width.
Colnago C-59 (Dura Ace)
Firefly(Ultegra)
Colnago C-64 disc(ultegra) with Bora 35 wheels
Firefly(Ultegra)
Colnago C-64 disc(ultegra) with Bora 35 wheels
Tread and tyre wear help also creat micro turbulence that keep the airflow to stay attached to the rim.
Basically you need a wider rim than your tyre to achieve "perfect " aerodynamic flow.
The goal is to keep the airflow attach to the object. When the air quit the object it create an empty space that need compensation and the compensation is pulling you back.
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Basically you need a wider rim than your tyre to achieve "perfect " aerodynamic flow.
The goal is to keep the airflow attach to the object. When the air quit the object it create an empty space that need compensation and the compensation is pulling you back.
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Patb095 wrote:Tread and tyre wear help also creat micro turbulence that keep the airflow to stay attached to the rim.
Basically you need a wider rim than your tyre to achieve "perfect " aerodynamic flow.
The goal is to keep the airflow attach to the object. When the air quit the object it create an empty space that need compensation and the compensation is pulling you back.
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Yep, hence you need at least 30mm wide rim and the only option out there is $2900 http://enve.com/products/ses-4-5-ar wheels and it's disc only!
Racing is a three-dimensional high-speed chess game, involving hundreds of pieces on the board.
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CBA = Chronic Bike Addiction OCD = Obsessive Cycling DisorderThe only thing that is funny about this is that your tyre get bigger with a wider rim. They should design larger width but keeping the inner width narrow so your 23 or 25 doesn't become 25 and 27 on a wider rim.
A lot of improvement is still to come over this wider rim thing. And the tyre manufacturers and the wheel manufacturers don't seem to work together on this.
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A lot of improvement is still to come over this wider rim thing. And the tyre manufacturers and the wheel manufacturers don't seem to work together on this.
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ArinastoDoge
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Where am i looking for it? We cant see a View first unread post. Got it. Its very good. What was there before? A&M
Patb095 wrote:The only thing that is funny about this is that your tyre get bigger with a wider rim. They should design larger width but keeping the inner width narrow so your 23 or 25 doesn't become 25 and 27 on a wider rim.
A lot of improvement is still to come over this wider rim thing. And the tyre manufacturers and the wheel manufacturers don't seem to work together on this.
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why does people want wide tire in the first place?
- to get more air volume,
--lower pinch flat chance
--lower rolling resistant since the tire is effectively harder (it compress less on contact with the road)
--- now you can run lower psi for comfort
- to get wider contact path
wider rim effectively turn the narrower tire into a wider one, you get all the benefit above including the possibility to reduce tire pressure (and the tire weight less!). Then why don't just treat a 23c on wide rim like a 25c tire on narrow rim?
Hexsense wrote:Patb095 wrote:The only thing that is funny about this is that your tyre get bigger with a wider rim. They should design larger width but keeping the inner width narrow so your 23 or 25 doesn't become 25 and 27 on a wider rim.
A lot of improvement is still to come over this wider rim thing. And the tyre manufacturers and the wheel manufacturers don't seem to work together on this.
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why does people want wide tire in the first place?
- to get more air volume,
--lower pinch flat chance
--lower rolling resistant since the tire is effectively harder (it compress less on contact with the road)
--- now you can run lower psi for comfort
- to get wider contact path
wider rim effectively turn the narrower tire into a wider one, you get all the benefit above including the possibility to reduce tire pressure (and the tire weight less!). Then why don't just treat a 23c on wide rim like a 25c tire on narrow rim?
Good point !
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