wider rear tires upgrade

**dalton** · 17th June 2005, 04:19

m just wondering if its applicable or if any one here tried fitting a swing arm of a kawasaki zzr 400 or any other bike that has at least 4inc.-up rear rims to a fzr 250 2kr? im up to widening my rear tire just for show.. my swing arm is now a deltabox swing arm from a 3ln exup 250 that has a 3.5 in rims.

just wanna know some pros and cons about my project and if its applicable and also what are to expect that has to be done.

thank you in advance guys.
ride strong, feel the rush..

**What?** · 17th June 2005, 06:18

Show is one thing, but it might not be so flash if you want "go"as well. The biggest con is that it may handle like a POS with the fat rear.

**bugjuice** · 17th June 2005, 09:11

it'll change the dynamics of the bike for sure. The back will grip way more than your stock front wheel, which means mid-hard-corner, the back will wanna keep gripping, where as the front will quickly give up and let go. If you only want it for show, and you're not ever going to push it on the open road, then you can do what this guy did. Else if you do, then the manufacturers made the bike with those specs/rims for a reason.

Talls n shorts of it, if you're willing, nothing is impossible within reason, but if you want to keep it as ridable as poss, then you're better off leaving it be..

**Quasievil** · 17th June 2005, 09:19

Why would you bother ? look at 125 race bikes on skinny tyres kicking the arse out of track times of 1000cc bikes, wider tyres dont make you faster.

if anything doing this will upset the handling of your bike for the worse, keep it standard, Im pretty sure the manuafacturer had it sussed

**TonyB** · 17th June 2005, 09:31

Yep, agree with the above. They only put big tyres on sports bikes to try and get the power on the road via the bigger contact patch offered. 125's have skinny wee tyres and go round corners like nobodys business- much faster than the MotoGP bikes. If your riding a sports bike and don't care how it goes round corners then perhaps you've got the wrong style of bike?

**vifferman** · 17th June 2005, 09:31

Originally Posted by Quasievil

Why would you bother ?

Because you've got a small wang? :spudwhat:

**Eurodave** · 17th June 2005, 09:43

Looks like an escapee from "American Chopper". Bikes with ginormously oversized wide back wheels/tyres handle strangely as well according to various articles Ive read

**Pwalo** · 17th June 2005, 10:01

Originally Posted by Eurodave

Looks like an escapee from "American Chopper". Bikes with ginormously oversized wide back wheels/tyres handle strangely as well according to various articles Ive read

That sure is a scary looking rear end. I must concur with my fellow bikers in that I've never seen an article, or had a mechanic recommend fitting a larger rear tyre to improve handling.

A couple of chaps who ride 1000cc sportsbikes that I've spoken to have actually gone to a slightly narrower rear to improve their bike's road manners.

**crazylittleshit** · 17th June 2005, 10:08

Originally Posted by bugjuice

it'll change the dynamics of the bike for sure. The back will grip way more than your stock front wheel, which means mid-hard-corner, the back will wanna keep gripping, where as the front will quickly give up and let go. If you only want it for show, and you're not ever going to push it on the open road, then you can do what this guy did. Else if you do, then the manufacturers made the bike with those specs/rims for a reason.

Talls n shorts of it, if you're willing, nothing is impossible within reason, but if you want to keep it as ridable as poss, then you're better off leaving it be..

compensating are we?

**bugjuice** · 17th June 2005, 10:11

Originally Posted by crazylittleshit

compensating are we?

hey, mines' stock 'n' sticky mate

I also don't own a porsche.
but I'm sure this guy has a garage of 'em

**Lou Girardin** · 17th June 2005, 10:42

Merkins need fat rear ends to carry their XXXXXXXXXXXL oversize arses.

**DingDong** · 17th June 2005, 19:03

Well you know now it'll handle like shit, the radius (across) of the tyres should be the same or it wont turn too safely... but because it's just for looks, find a wheel you like that is attached to a swing arm, take the whole bike and new wheel to an engineering shop and get it chopped and rewielded.
You need the whole bike so they can get it straight for you and line up the sprockets.
They may also need to brace it, or you may die.

You could try to fit the new swing-arm with packing and buying new bearings, and you'll need to get the axle modified too.

You do know your gona wreak it dont you?

**Pixie** · 18th June 2005, 11:20

Originally Posted by Eurodave

Looks like an escapee from "American Chopper". Bikes with ginormously oversized wide back wheels/tyres handle strangely as well according to various articles Ive read

The wider the tyre the more the contact patch moves from the center line of the bike when leaned over .As the C of G generally passes through the center line in normal riding the effect is of lifting the bike's mass as you lean i.e. the bike resists leaning.
Plus a whole shitload of other detrimental effects caused by over wide tyres.