Symmetrical vs asymmetrical

[Quagga]

2.3+ tyres = surely you want 30mm plus?

Else you are just pulling the tyre in ?

 

I have 2.3 front with 30mm internal and that tread is is all on the grond and I can now run at least .1-2 bar less

[GrahamS2]

2.3+ tyres = surely you want 30mm plus?

Else you are just pulling the tyre in ?

 

I have 2.3 front with 30mm internal and that tread is is all on the grond and I can now run at least .1-2 bar less

Also depends on the tyre and rim combo. I run 2.35 ground controls on a 25mm internal width and they are spot on.

[Quagga]

Also depends on the tyre and rim combo. I run 2.35 ground controls on a 25mm internal width and they are spot on.

I have the same tyre on 30mm internal and my tire looks like the middle one.

 

2.35 inches = 59.69mm which means that you will only get to the bell around 50mm internal width

[Captain Fastbastard Mayhem]

I have the same tyre on 30mm internal and my tire looks like the middle one.

 

2.35 inches = 59.69mm which means that you will only get to the bell around 50mm internal width

EXACTLY. 

 

But, I have to say. A 2.35 GC isn't actually 2.35", in my experience. 

 

Plus - that infographic is highly geared towards their own range of wheels.

[GrahamS2]

I have the same tyre on 30mm internal and my tire looks like the middle one.

 

2.35 inches = 59.69mm which means that you will only get to the bell around 50mm internal width

Exactly. Despite all the hype over "going wide", a 5mm difference in internal width is marginal at best.

[Captain Fastbastard Mayhem]

Exactly. Despite all the hype over "going wide", a 5mm difference in internal width is marginal at best.

Ah, but that marginal difference makes a massive difference to the overall volume of the system, which means you can run slightly lower pressures and get moaaarr grips. 

 

5mm on 25 = 20% more. That's not an inconsiderable amount more volume. 

[Quagga]

Exactly. Despite all the hype over "going wide", a 5mm difference in internal width is marginal at best.

I have a set of Arch 26mm internal with the same tyres on as my 30mm internal carbons. And the only other difference is that the carbon is hookless.

 When I measure the tyres I only see about 1.8mm wider on the carbon wheelset .

 

But for some reasong the carbon "feels" like the front has MORE grip than the Arch 

 

Might be my mind telling me they MUST be better 

[GrahamS2]

Ah, but that marginal difference makes a massive difference to the overall volume of the system, which means you can run slightly lower pressures and get moaaarr grips. 

 

5mm on 25 = 20% more. That's not an inconsiderable amount more volume. 

Not convinced it would be that massive. Someone clever could do the exact calcs on the volume increase that 20% more rim width gives.

[Captain Fastbastard Mayhem]

Not convinced it would be that massive. Someone clever could do the exact calcs on the volume increase that 20% more rim width gives.

yeah, you're right. The ovoid shape of the tyre kinda throws it off. 

[GrahamS2]

yeah, you're right. The ovoid shape of the tyre kinda throws it off. 

Without reverting to my old text books, I'd guess that a 20% increase in rim width (from 25mm to 30mm) will give roughly 5% increase in overall volume. I'll see if I can find an online calc or something a bit later. 

[Quagga]

Shame OP asked sym or Asym and now we are on volume and % increase..... eish so easy to get side tracked. 

 

While we are at it. Do you think asym will work better with XTR pad on Sram XX brakes... :-)

[GrahamS2]

Shame OP asked sym or Asym and now we are on volume and % increase..... eish so easy to get side tracked. 

 

While we are at it. Do you think asym will work better with XTR pad on Sram XX brakes... :-)

LOL, this is bikehub. That's the norm. 

[PhilipV]

2.3+ tyres = surely you want 30mm plus?

Else you are just pulling the tyre in ?

 

I have 2.3 front with 30mm internal and that tread is is all on the grond and I can now run at least .1-2 bar less

And what happens if you lean the bike over really hard?

Suddenly your sideknobs have no support from the transition knobs, and your sidewalls need to work harder as there is 0.2bar less pressure to keep it rigid.

[Quagga]

And what happens if you lean the bike over really hard?

Suddenly your sideknobs have no support from the transition knobs, and your sidewalls need to work harder as there is 0.2bar less pressure to keep it rigid.

[PhilipV]

 

And what happens if you lean the bike over really hard?

Suddenly your sideknobs have no support from the transition knobs, and your sidewalls need to work harder as there is 0.2bar less pressure to keep it rigid.

Put enough air in the red tyre and the situation is different.

[Quagga]

Put enough air in the red tyre and the situation is different.

And then you have less contact area on the ground? Wider rim and wider tyre puts more rubber on the ground hence more grip.

 

Google what pressure the PRO's run, saw a video clip of Nino saying you should "almost" feel the rim if you put your them accross the tyre and then push down with other hand and ALL your weight.