Heavy Vs light tyres

You'll notice that the bike feels a tad livlier on the lighter tyres when accelerating or hill climbing...at a staedy rate on the flat you'll notice nothing due to weight...BUT, a lighterv tyre may be more supple and so will roll better especially over imperfect road surfaces and be a tad more comfortable. Lighter tyres may p*ncture more, but IMO are generally nicer to ride.

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The pessimists of this world are rarely disappointed....
Fab's TCR1

Well, I changed from my illustrious Armadilos to Gator Skins. Not a huge change in weight, but I did notice a change in rolling and overall speed. Mostly uphill.

The weight of the tyre is (obviously) at the outside of the wheel making it very influential due to the acceleration both forward and back all the time. 100 grams saved on the pedals are similar to 200 grams saved on the frame. So I would guess that 100 grams saved on the tyre are at least as much


A'z

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<font color="violet"><b>Going uphill fast, is easy; all you need are legs and lungs. Going downhill fast is hard... you need... balls.</b></font id="violet"></font id="size1">
Only one way to swim 100m free style - you start as hard as you can, then slowly accelerate.

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by JWSurrey</i>

bizarre considering the lack of noticable tread pattern.
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not odd at all

i'm quoting sheldon here

<i><b>Tread for on-road use

Bicycle tires for on-road use have no need of any sort of tread features; in fact, the best road tires are perfectly smooth, with no tread at all!

Unfortunately, most people assume that a smooth tire will be slippery, so this type of tire is difficult to sell to unsophisticated cyclists. Most tire makers cater to this by putting a very fine pattern on their tires, mainly for cosmetic and marketing reasons. If you examine a section of asphalt or concrete, you'll see that the texture of the road itself is much "knobbier" than the tread features of a good quality road tire. Since the tire is flexible, even a slick tire deforms as it comes into contact with the pavement, acquiring the shape of the pavement texture, only while incontact with the road.

People ask, "But don't slick tires get slippery on wet roads, or worse yet, wet metal features such as expansion joints, paint stripes, or railroad tracks?" The answer is, yes, they do. So do tires with tread. All tires are slippery in these conditions. Tread features make no improvement in this.</i></b>

Can`t , unfortunately, find the thread, but there was a link to table of tyre rolling resistances which surprisingly showed that a tyre like an Armadillo was of similar rolling resistance to a much lighter tyre, although the former was very pressure dependent (Alfablue knows the link??)

JamesB MTB

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by caracolito</i>

Well, I changed from my illustrious Armadilos to Gator Skins. Not a huge change in weight, but I did notice a change in rolling and overall speed. Mostly uphill.

The weight of the tyre is (obviously) at the outside of the wheel making it very influential due to the acceleration both forward and back all the time. <b>100 grams saved on the pedals are similar to 200 grams saved on the frame. So I would guess that 100 grams saved on the tyre are at least as much</b>


A'z

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<font color="violet"><b>Going uphill fast, is easy; all you need are legs and lungs. Going downhill fast is hard... you need... balls.</b></font id="violet"></font id="size1">
Only one way to swim 100m free style - you start as hard as you can, then slowly accelerate.
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I've believe that its actually a factor of 4 on the rim of a wheel so changing from say conti ultra gator skins @ 300g each to GP400 @ 200g each will save an efeective 800g (over both wheels)!! chuck in their supersonic tubes (30g lighter than standard ones) and you save another 240g!! Even the static weight saving is over half a pound, its got to be one of the cheapest, effective upgrades going.

pm

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by TR</i>
Also, for a given tyre construction and compound, a 25c will roll a bit better than a 23c. The extra weight of the larger tye section is only felt during acceleration, which is only an issue for bunch racing according to Mr Hallett.
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Yeah, none of us wants to get dropped in Le Tour de Commute! [:D]

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Porridge not Petrol
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American Idol Forums

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by portuguese mike</i>

I've believe that its actually a factor of 4 on the rim of a wheel so changing from say conti ultra gator skins @ 300g each to GP400 @ 200g each will save an efeective 800g (over both wheels)!! chuck in their supersonic tubes (30g lighter than standard ones) and you save another 240g!! Even the static weight saving is over half a pound, its got to be one of the cheapest, effective upgrades going.

pm
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It takes twice as much energy to accelerate the mass of the tyre up to speed as it would if the same mass were on the frame.

You can either think of it as adding the energy to accelerate a non-spinning tyre to that required to spin a stationary tyre so that the speed of the rim matches the road speed, or you can average the kinetic energy of the tyre around the tyre - at the bottom it's not moving (zero KE) and at the top it's moving twice as fast (KE is 4 times).