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Online KildareMan

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Re: Physics of cornering with a 21" wheel
« Reply #10 on: October 11, 2018, 07:06:57 AM »
You're wrong. The 21 is a skinny tyre at a 90 section so has a small(er) contact area.
Stupid is as stupid does.
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Offline nick2018

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Re: Physics of cornering with a 21" wheel
« Reply #11 on: October 11, 2018, 09:23:00 AM »
Yes. And it would be good if they made a 100 section but there is very little choice for the tubed 21".
I have mitas 100/80/21 on my KTM and it works well.

Offline Dilbert

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Re: Physics of cornering with a 21" wheel
« Reply #12 on: October 11, 2018, 12:53:14 PM »
As Rtwo a 21" wheel just makes it turn in slower, so requires a little more thought and a bit more effort, saying that the same gyroscopic forces will snap you back upright in a flash when accelerating out of a corner, this was my favourite trick coming off the M6 at Thelwall J21 northbound slip road on an old Africa Twin 650cc  :001:

Offline Dick

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Re: Physics of cornering with a 21" wheel
« Reply #13 on: October 11, 2018, 09:32:02 PM »
Sounds cool !
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Online troop

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Re: Physics of cornering with a 21" wheel
« Reply #14 on: October 14, 2018, 01:47:23 PM »
Just this past week I completed a swap from XCx spoke wheels > XR cast wheels. Between the 19" front and new Bridgestone A41 tires, the change in feel is dramatic. The 19"/A41 combo has much smoother turning. I'm also running a 100/90-19 tire and not a 110/80R-19.

Offline Ivanonghockguan

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Re: Physics of cornering with a 21" wheel
« Reply #15 on: December 06, 2018, 08:04:53 AM »
*Originally Posted by troop [+]
Just this past week I completed a swap from XCx spoke wheels > XR cast wheels. Between the 19" front and new Bridgestone A41 tires, the change in feel is dramatic. The 19"/A41 combo has much smoother turning. I'm also running a 100/90-19 tire and not a 110/80R-19.

Nice - also thought of doing that - Can posts some picture of that setup pls - how is the bike's Stance after that ? looks OK  ? do show .
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Online troop

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Offline NORTY

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Re: Physics of cornering with a 21" wheel
« Reply #17 on: December 08, 2018, 05:39:55 AM »
*Originally Posted by nick2018 [+]
I am very happy with my xca and also like the seating  position which is like a big dirtbike and that's what I am used to.However, going into corners on a dirtbike motocross style is a lot different to a 130mph xca going into bends.

As the xca is probably 95% road, I am asking those with experience of both the 19" & 21" whether they notice a "seat in the pants" difference when riding twisties.

i.e. whether one is actually better or whether the 21" just requires different input .
Dunno if you'd want to push an XCA hard enough to do "a buck thirty into bends..." It's not the diameter you'd want to concern yourself with. It's the lack of appropriate rubber available in a 21" size. Triumph adjust the XC's rake/trail to accommodate  a larger diameter hoop up front.
In short~ Use the correct tool for the job...
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Offline RaglandT

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Re: Physics of cornering with a 21" wheel
« Reply #18 on: December 08, 2018, 06:21:28 AM »
*Originally Posted by NORTY [+]
Dunno if you'd want to push an XCA hard enough to do "a buck thirty into bends..." It's not the diameter you'd want to concern yourself with. It's the lack of appropriate rubber available in a 21" size. Triumph adjust the XC's rake/trail to accommodate  a larger diameter hoop up front.
In short~ Use the correct tool for the job...

That's pretty much what drove me to converting my XC to Roadie wheels.  That and a flat tire.  Gotta love those tubeless rims ...

 


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