Tyre Decision

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Triumph1300 · #1 Post by **Triumph1300** » Tue Nov 07, 2006 7:05 pm

I need 2 tyres for BUD, which is sat on Sprint alloys.
Has anyone any expereience of 185/70 x 13 on the back?
I'm just thinking that a bit of width, and a bit more sidewall may help the gearing a touch more.
If not, I'll stick with 175/70

Answers on a forum please!

BWJ (Incredibly happy)

Lewis · #2 Post by **Lewis** » Tue Nov 07, 2006 7:07 pm

Run 185s a few times, I think the difference is pretty neglible!

Maybe fill the arches a little better?

1300dolly · #3 Post by **1300dolly** » Tue Nov 07, 2006 7:44 pm

width will not make any difference to gearing. just a bit more rubber on the road. go with the skinny steels, great fun at this time of year.

tinweevil · #4 Post by **tinweevil** » Tue Nov 07, 2006 7:55 pm

Don't go large if your rear bushes are getting elderly. Blue had 185/70 on the back when I got it, they rubbed on bumps, hard cornering and very badly with rear passengers. The rubbers weren't great but I wouldn't have called them knackered either. I've not retried it since rebushing and other on here have had better luck than me.

From memory 185/60 is a closer match in the rolling circumference so will affect the speedo less.

Tinweevil

miniman · #5 Post by **miniman** » Tue Nov 07, 2006 8:04 pm

1300dolly wrote:width will not make any difference to gearing. just a bit more rubber on the road. go with the skinny steels, great fun at this time of year.

Well, the width will make a difference to the gearing as it can influence the sidewall depth depending upon the code of the tyre.

e.g.

165/80 R13 is 165mm wide and 80% of that is 132mm

185/80 R13 is 185mm wide and 80% of that is 148mm

Which means the rolling circumference of the 185/80 is greater.

1300dolly · #6 Post by **1300dolly** » Tue Nov 07, 2006 8:05 pm

i retract my previous statment
70 is the % of width so so a 180 will be taller than a 175 but probably not enough to alter the gearing noticably

miniman · #7 Post by **miniman** » Tue Nov 07, 2006 8:22 pm

1300dolly wrote:but probably not enough to alter the gearing noticably

Indeed, I have to admit to being a touch on the pedantic side there

#8 Post by **Mad Mart** » Tue Nov 07, 2006 8:31 pm

I ran 185/70s on the rears once but they do tend to touch the lip on the inside of the rear wheel arch, especially with passengers in t'back.

SprintV8 · #9 Post by **SprintV8** » Tue Nov 07, 2006 9:36 pm

http://www.mintylamb.co.uk/?page=tyre.htm

1300dolly · #10 Post by **1300dolly** » Tue Nov 07, 2006 11:06 pm

miniman, i think i posted my retraction at the same time as your post.

Dollyboy · #11 Post by **Dollyboy** » Wed Nov 08, 2006 8:52 am

im going to try to find 185/65's for orange... shes on 185/60's at the mo

Sprint36 · #12 Post by **Sprint36** » Wed Nov 08, 2006 9:39 am

Bruce,

I do have some 185/70s here, but they are on non-Sprint alloys with a different offset, so no good for a quick check. However, you're welcome to have the tyres for the price of removing them from the wheels if you want to take them away and try them on some sprint wheels.

David

Neil907 · #13 Post by **Neil907** » Wed Nov 08, 2006 5:30 pm

I used to run 185 70s on my 1850 on sprint rims.
They rubbed ocasionally on the inside due to worn bushes but were fine once it was polly bushed.
The sprints tend to rub on the outer lip due to having the wider rear axle.

Dollyboy · #14 Post by **Dollyboy** » Wed Nov 08, 2006 5:32 pm

wider axle? think its just the rear drums/brakes that are wider, but i could be wrong...

Neil907 · #15 Post by **Neil907** » Wed Nov 08, 2006 6:36 pm

The sprint axle between hub faces measures 54"
And 1850/ 1500 axle measures 53 1/4"

which gives a track of 50 3/4" and 50" respectively.

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