Why a 19" tire? - Kawasaki Versys Forum
 
LinkBack Thread Tools Display Modes
post #1 of 17 (permalink) Old 07-20-2010, 06:10 PM Thread Starter
Member
 
STeelybeast's Avatar
 
Join Date: May 2008
Location: Ellijay & Suwanee, GA.
Posts: 136
Mentioned: 0 Post(s)
Why a 19" tire?

Something I have been wondering about for a while about is why a lot of folks want a 19" tire on a dirt bike or dual sport? I have seen many people discuss why the the almighty "V" is not as capable off road compared to a V-strom.

This is not to knock the bike for offroad as I have seen those who ride it everywhere, just wondering exactly what a 19" front tire buys you off road. I rode dirt bikes as a kid, but I don't recall the advantage of a bigger tire on the front.

Does it go over ditches better with a larger front tire or more stable in the dirt?

Inquiring minds wanna know.....

2008 Versys
2004 Honda ST1300
STeelybeast is offline  
Sponsored Links
Advertisement
 
post #2 of 17 (permalink) Old 07-20-2010, 06:26 PM
Member
 
Join Date: Jun 2008
Location: Hillsburrito
Posts: 1,018
Mentioned: 0 Post(s)
A 19" inch front mostly buys you a much wider tire choice to meet the different "off-road" needs. Whether you really need those knobbies to ride dirt and gravel roads is an entirely different question. The larger diameter wheel also helps going over obstacles (but I doubt it's a significant percentage of use).

Gustavo


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Gustavo is offline  
post #3 of 17 (permalink) Old 07-20-2010, 09:51 PM
Member
 
Trackrider54's Avatar
 
Join Date: Jun 2010
Location: Nashville, TN
Posts: 69
Mentioned: 0 Post(s)
A 19" wheel also LIMITS your street tire choices. Most people who buy a V-Strom never take it off road. The 19" tire is mostly for the "look" it gives the bike.
Trackrider54 is offline  
 
post #4 of 17 (permalink) Old 07-21-2010, 07:13 AM Thread Starter
Member
 
STeelybeast's Avatar
 
Join Date: May 2008
Location: Ellijay & Suwanee, GA.
Posts: 136
Mentioned: 0 Post(s)
The more I am thinking about, see if my logic makes sense

If there was an 8 inch diameter log, laying across the road and I wanted to ride over it. I would think a bigger diameter tire would be an advantage.

This is an exageration, but if I had an 8 inch tire, I would just basically come up to the log and stop. If I had a 17 inch tire, I could roll over it as the right side of the triangle when the tire was against the log, would be straighter. This triangle would be the left side as the log, the bottom as the ground and the right side as the tire. This would allow it go easier over the log with less force. Go up to a 20 inch tire, it's probably a little easier.


I think I answered my own question now that I think about it......

I am not looking to swap to a 19" tire, just been trying to figure out the advantage of it.

David

2008 Versys
2004 Honda ST1300
STeelybeast is offline  
post #5 of 17 (permalink) Old 07-21-2010, 09:58 PM
Member
 
Trackrider54's Avatar
 
Join Date: Jun 2010
Location: Nashville, TN
Posts: 69
Mentioned: 0 Post(s)
I've always believed in using a tool for it's proper task. I don't typically drive screws with a hammer or drive nails with a screwdriver.

To me, that's what taking a bike like the Versys, V-Strom, Ulysses, GS, Tiger, Multistrada, etc. down a single track trail, up steep hills, or over big obstacles like.

Riding down an improved gravel road is something any motorcycle can do. Even sportbikes can navigate some pretty gnarly roads as seen here:



Anyone who watched the show "Long Way Round" which featured Ewen McGregor and Charlie Boorman circumnavigating the world on hulking BMW GSes will remember that Claudio, their camera man, ended up on a cheap, lightweight POS bike when his BMW broke down. He was able to maneuver much easier and cross obstacles the big GSes couldn't due to their weight.

Biggest bike I would ever want to ever take in the soup is a KLR. I tried it once, and got stuck. Had to drag that sucker out by myself. Even that bike is pretty dang heavy.

19" front wheel or not, a 400+lb bike is a heavy beast in the deep stuff. A 500lb bike is past the point of fun (unless you like destroying your motorcycle).

Now, piloting a trials bike over big logs and such is a great deal of fun. Drop it, pick it up, keep going.
Trackrider54 is offline  
post #6 of 17 (permalink) Old 07-21-2010, 11:49 PM
Super Moderator
 
Join Date: Feb 2009
Location: San Francisco, CA
Posts: 459
Mentioned: 0 Post(s)
Actually it is physics. The larger diameter front tires have a greater gyroscopic effect, that increases stability. So when you hit sand with a 17" front it is much easier for the sand/gravel/rocks to alter the direction of travel. The 19" (or better yet 21") front tires are deflected less and therefore track better in sand and gravel. However this means that on a twisty canyon road these larger diameter wheels are harder to flick through the corners. The increased stability is less desirable on the street.

Steve

IBA #37625 (Earned in 98 Awarded in 2009... Yeah I'm a little lazy sometimes...)


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
lonerockz is offline  
post #7 of 17 (permalink) Old 07-22-2010, 02:18 AM
Member
 
kevrider's Avatar
 
Join Date: Jan 2010
Location: reno
Posts: 670
Mentioned: 0 Post(s)
this italicized portions are copied from a mtn bike website. bikes with 29" wheels are becoming more popular nowadays. the benefits of the bigger wheels on a mtn bike, relative to the standard 26" wheel, are similar to the benefits of a larger front on a motorcycle.

Better Roll Over: Okay, lets get this out of the way right off the bat. 29″ers have a different “angle of attack” in relation to trail obstacles you might encounter. This realizes itself to riders as a smoother feel. Sometimes it negates the need for front suspension for some trail riders, thus the plethora of rigid front forks on big wheelers. It is also interesting to note that what is good for the front wheel is also good for the rear wheel.

Steely, you were describing the angle of attack concept. it essentially makes the obstacle smaller; the climb onto the obstacle is not as steep, therefore it costs less energy.

Better Traction: 29″ers, by the nature of the diameter of the wheel, have a differently shaped contact patch than 26″ers do. (Some would argue that it is a bigger contact patch) However it really is, it is obvious that a 29″er has an ability to claw it’s way up steeps and technical climbs that smaller diameter wheels can not match. This is aided by the following attribute……

about mtn bike tires... it is said that the contact patch for the larger diameter tire will be longer and more narrow (for the same pressure) which seems to help the tire dig a little deeper thru loose stuff to gain purchase on the more solid ground beneath. the shorter, wider contact patches will ride on top and be subjected to deflection while providing less traction.

Better Momentum Conservation: One of the oft overlooked characteristics of 29 inch wheels is their propensity for carrying momentum better than smaller wheel sizes do. This helps in clearing climbs, but it also causes 29″ers to be a bit tougher to get going from a slow speed, or stopped situation. If a 29″er rider can learn to work with the momentum factor of 29″ers, it can become one of your greater allies. Less braking is necessary due to the stability and better traction of 29 inch wheels. So if you can learn to trust that, the momentum saved can be a big benefit. Smaller wheels tend to not have any of these traits in the amount that 29″ers do, so using momentum with smaller wheel sizes doesn’t work nearly as well.

Gyroscopic Effect: While this is very closely related to the above mentioned benefit, I broke it out because this is the one thing that makes 29″ers seem so “safe” when downhilling, or while attacking technical terrain. A 29 inch wheel by its very nature will want to stay upright better than a smaller wheel will. This can work for you not only in high speed down hills, but in slower technical terrain as well. It is one of the reasons why many taller riders feel that the 29″er bike is less likely to “endo” than smaller wheeled bikes.

Loose Terrain Traversing/Traction: There is a reason why early 29″er pioneers were winning mud bog contests and crossing sandy desert terrain better than their 26″er brethren were. The wheels seem to really excel at crossing loose sand, mud, and even snow. This is a direct result of many of the above mentioned benefits working in concert with each other, but is remarkable, so I mentioned it as a stand alone trait.

i have explored some roads on the old Transalp that i would not attempt on the versys. good thing, since more than once, this resulted in riding over obstacles that would have shut me down with this 17" front i have now; i have vivid memories of embedded boulders and half-buried culverts. the transalp certainly wasn't the right tool for the job, but i didn't know it until i was busting my knuckles. fortunately, tho' they may not be ideal, crescent wrenches can actually get it done sometimes. i guess that's the difference between bikes like KLR650, Tenere 660 compared to bikes like versys... the versys will talk some sense into you, while the others ask for trouble.

In a world full of people, only some want to ride. Isn't that crazy?
Seal/CRAZY/misquoted


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
=>
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Last edited by kevrider; 07-22-2010 at 02:39 AM.
kevrider is offline  
post #8 of 17 (permalink) Old 07-22-2010, 06:24 AM
Super Moderator
 
kiwi 41's Avatar
 
Join Date: Mar 2010
Location: 44.24'S 171.15'E Timaru, NewZealand
Posts: 8,622
Mentioned: 2 Post(s)
Send a message via Skype™ to kiwi 41
Quote:
Originally Posted by lonerockz View Post
Actually it is physics. The larger diameter front tires have a greater gyroscopic effect, that increases stability. So when you hit sand with a 17" front it is much easier for the sand/gravel/rocks to alter the direction of travel. The 19" (or better yet 21") front tires are deflected less and therefore track better in sand and gravel. However this means that on a twisty canyon road these larger diameter wheels are harder to flick through the corners. The increased stability is less desirable on the street.
I love this site, can even get a physics lesson. good explanation Lonerockz.

so a penny farthing will be the most stable bike through sand
kiwi 41 is offline  
post #9 of 17 (permalink) Old 07-22-2010, 08:51 AM Thread Starter
Member
 
STeelybeast's Avatar
 
Join Date: May 2008
Location: Ellijay & Suwanee, GA.
Posts: 136
Mentioned: 0 Post(s)
Quote:
Originally Posted by kiwi 41 View Post
I love this site, can even get a physics lesson. good explanation Lonerockz.

so a penny farthing will be the most stable bike through sand
Too Funny! I was actually thinking about the same bike with that big wheel in my head, going over a log

2008 Versys
2004 Honda ST1300
STeelybeast is offline  
post #10 of 17 (permalink) Old 07-22-2010, 08:54 AM
Super Moderator
 
kiwi 41's Avatar
 
Join Date: Mar 2010
Location: 44.24'S 171.15'E Timaru, NewZealand
Posts: 8,622
Mentioned: 2 Post(s)
Send a message via Skype™ to kiwi 41
I got to much time at work tonight my friend
kiwi 41 is offline  
post #11 of 17 (permalink) Old 07-22-2010, 03:12 PM
Member
 
kevrider's Avatar
 
Join Date: Jan 2010
Location: reno
Posts: 670
Mentioned: 0 Post(s)
Edwardian Day, iirc. Kiwi, is that you?





i think the helmet is for the mount/dismount.

In a world full of people, only some want to ride. Isn't that crazy?
Seal/CRAZY/misquoted


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
=>
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
kevrider is offline  
post #12 of 17 (permalink) Old 07-22-2010, 11:47 PM
Super Moderator
 
kiwi 41's Avatar
 
Join Date: Mar 2010
Location: 44.24'S 171.15'E Timaru, NewZealand
Posts: 8,622
Mentioned: 2 Post(s)
Send a message via Skype™ to kiwi 41
kiwi 41 is offline  
post #13 of 17 (permalink) Old 07-23-2010, 02:21 AM
Super Moderator
 
kiwi 41's Avatar
 
Join Date: Mar 2010
Location: 44.24'S 171.15'E Timaru, NewZealand
Posts: 8,622
Mentioned: 2 Post(s)
Send a message via Skype™ to kiwi 41
Quote:
Originally Posted by kevrider View Post
Edwardian Day, iirc. Kiwi, is that you?





i think the helmet is for the mount/dismount.
Not me kevrider, where those pic's taken as it look like Christchurch, NZ
kiwi 41 is offline  
post #14 of 17 (permalink) Old 07-23-2010, 03:27 AM
Super Moderator
 
Fastoman's Avatar
 
Join Date: Sep 2009
Location: Ipoh.Perak.Malaysia
Posts: 6,889
Mentioned: 6 Post(s)
Quote:
Originally Posted by kiwi 41 View Post
Not me kevrider, where those pic's taken as it look like Christchurch, NZ
What happens when you come to a traffic light with this bikes.

Jump off or put your legs on the car beside.

Fastoman is offline  
post #15 of 17 (permalink) Old 07-23-2010, 03:53 AM
Super Moderator
 
kiwi 41's Avatar
 
Join Date: Mar 2010
Location: 44.24'S 171.15'E Timaru, NewZealand
Posts: 8,622
Mentioned: 2 Post(s)
Send a message via Skype™ to kiwi 41
Quote:
Originally Posted by Fastoman View Post
What happens when you come to a traffic light with this bikes.

Jump off or put your legs on the car beside.

You need to have a good balance
kiwi 41 is offline  
post #16 of 17 (permalink) Old 07-23-2010, 04:40 AM
Member
 
kevrider's Avatar
 
Join Date: Jan 2010
Location: reno
Posts: 670
Mentioned: 0 Post(s)
Quote:
Originally Posted by kiwi 41 View Post
as it look like Christchurch, NZ
it was Christchurch, in Feb last year, on my way to throw a leg over the Britten.

Quote:
Originally Posted by Fastoman View Post
put your legs on the car beside.
that'd be awesome!

In a world full of people, only some want to ride. Isn't that crazy?
Seal/CRAZY/misquoted


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
=>
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Last edited by kevrider; 07-23-2010 at 04:43 AM.
kevrider is offline  
post #17 of 17 (permalink) Old 07-23-2010, 04:56 AM
Super Moderator
 
kiwi 41's Avatar
 
Join Date: Mar 2010
Location: 44.24'S 171.15'E Timaru, NewZealand
Posts: 8,622
Mentioned: 2 Post(s)
Send a message via Skype™ to kiwi 41
Hey kevrider, you certainly get around, Christchurch is 100 mile north of me and where my fast orange V came from
kiwi 41 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Versys Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome