Corsa Pro vs GP5000 STR - tread width

[TobinHatesYou]

We are off topic here but I started listening to a podcast with Matej Mohorič (in Slovenian though) where he is saying cornering with motorbike or bicycle is "complete opposite" (my words), he says you lean more lighter object while heavier one stays more upright, i.e. you lean more bicycle in cycling and rider in motorbiking.

I agree with this because the forces trying to right the motorcycle are even greater. One striking example is seeing Emma Pooley descending in older GCN videos, she leans the bike way more than she leans herself and that's also more of the style I've adopted.

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Got this vid recommended to me on YouTube earlier. From 8 minutes on it gets to what we've been discussing...



Can safely say I'm going to stop putting my upper body weight into the inside of the corner from now on. Haven't crashed a bicycle in a corner (yet) but looks like this could be timely advice as seems like my technique needed work.

[wheelbuilder]

Got this vid recommended to me on YouTube earlier. From 8 minutes on it gets to what we've been discussing...



Can safely say I'm going to stop putting my upper body weight into the inside of the corner from now on. Haven't crashed a bicycle in a corner (yet) but looks like this could be timely advice as seems like my technique needed work.

Chapeau. Not many would admit, let alone write on a forum that anything they do or own needs work. Refreshing.

[andy4g63]

We are off topic here but I started listening to a podcast with Matej Mohorič (in Slovenian though) where he is saying cornering with motorbike or bicycle is "complete opposite" (my words), he says you lean more lighter object while heavier one stays more upright, i.e. you lean more bicycle in cycling and rider in motorbiking.

I agree with this because the forces trying to right the motorcycle are even greater. One striking example is seeing Emma Pooley descending in older GCN videos, she leans the bike way more than she leans herself and that's also more of the style I've adopted.

As Mr Gib referred earlier,
I am coming from skiing background, the hips are what separates upper and lower body...

In skiing if you lean hard enough and your upper body is inline with your legs, you are f'"*Ed. Basically washed out, because the angle/axis between your upper body and skis/called critical edge angle/ should be less than 90*...

If it's more you slide out....

Looks like the same applies to the bicycle.

That upper body turned more or less opposite on the turn direction is called counter...

And on the bike is almost impossible to do, unless you move your bum like Pidcock

[parajba]

Sorry are we saying that this tyre has narrower tread width compared to the GP5000S TR? From the picture it looks like the tread is excellent and does well around it.

https://www.sigmasports.com/item/Vittor ... 96#reviews

[TobinHatesYou]

Sorry are we saying that this tyre has narrower tread width compared to the GP5000S TR? From the picture it looks like the tread is excellent and does well around it.

https://www.sigmasports.com/item/Vittor ... 96#reviews

That picture is a drawing/render…

Real Corsa Pros expose a lot more sidewall.

Here’s a comparison of a 28mm Corsa Pro and a 28mm Bontrager Aeolus RSL tire. The casing width is identical, but the Bontrager’s tread is 7-8mm wider.

[alanyu]

Bontra RSL is much more attractive to me now, waiting for BRR results

[parajba]

Sorry are we saying that this tyre has narrower tread width compared to the GP5000S TR? From the picture it looks like the tread is excellent and does well around it.

https://www.sigmasports.com/item/Vittor ... 96#reviews

That picture is a drawing/render…

Real Corsa Pros expose a lot more sidewall.

Here’s a comparison of a 28mm Corsa Pro and a 28mm Bontrager Aeolus RSL tire. The casing width is identical, but the Bontrager’s tread is 7-8mm wider.

Wow, that is quite a difference! I will cancel my order and stick with the GP5000S TR for now.

[BigBoyND]

And yet the Corsa tread is enough for half the pro peloton. A few of you might need the extra width, but most don't.

[TobinHatesYou]

And yet the Corsa tread is enough for half the pro peloton. A few of you might need the extra width, but most don't.

The Corsa is also objectively slow according to every independent test and half the pro peloton uses it. Extra tread width is about more than lean angle, it is the first line of defense against shoulder punctures on flinty roads, riding over twigs or other detritus, etc.

[parajba]

I found this picture online, of the Corsa Pro TLR. The tread width looks very standard here. Am not disputing what you guys are saying, but in this picture I honestly don't see anything wrong. There is plenty of tread for cornering at any level. Is it perhaps a function of the rim IW and that these tyres stretch once installed? Or is the narrow tread a properly documented fact? Sorry so many questions.

https://ibb.co/ZMyGzSJ

[6fu]

And yet the Corsa tread is enough for half the pro peloton. A few of you might need the extra width, but most don't.

The Corsa is also objectively slow according to every independent test and half the pro peloton uses it. Extra tread width is about more than lean angle, it is the first line of defense against shoulder punctures on flinty roads, riding over twigs or other detritus, etc.

Cotton tires usually don't test as well on steel drums as stiffer tires like gp5000. On the road they do feel a lot more supple so not sure how that translates to real world rr.

Even on drum the difference is less than a watt...

[TobinHatesYou]

Cotton tires usually don't test as well on steel drums as stiffer tires like gp5000. On the road they do feel a lot more supple so not sure how that translates to real world rr.

Even on drum the difference is less than a watt...

The Corsa Pro tested slow on a treadmill with a real rider and power measured by BodyRocket pedals. At 40km/h the GP5K S TR had 16W loss per tire while the Corsa Pro had 21W loss per tire.

[6fu]

Cotton tires usually don't test as well on steel drums as stiffer tires like gp5000. On the road they do feel a lot more supple so not sure how that translates to real world rr.

Even on drum the difference is less than a watt...

The Corsa Pro tested slow on a treadmill with a real rider and power measured by BodyRocket pedals. At 40km/h the GP5K S TR had 16W loss per tire while the Corsa Pro had 21W loss per tire.

I don't think the problem is with real rider vs weighs, but the surface. Treadmill =/= road.

[alanyu]

Cotton tires usually don't test as well on steel drums as stiffer tires like gp5000. On the road they do feel a lot more supple so not sure how that translates to real world rr.

Even on drum the difference is less than a watt...

The Corsa Pro tested slow on a treadmill with a real rider and power measured by BodyRocket pedals. At 40km/h the GP5K S TR had 16W loss per tire while the Corsa Pro had 21W loss per tire.

Corsa Pro is roughly 1W slower than GP5K STR on both (realistic) smooth and rough ground, tested by Tour.