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60R vs 65R #4472787
07/28/17 07:45 AM
07/28/17 07:45 AM
Joined: Jan 2013
Posts: 2,068
Texas
WyrTwister Offline OP
WyrTwister  Offline OP
Joined: Jan 2013
Posts: 2,068
Texas
Will this make ant significant difference on a little 2015 Chevy Sonic . A few MPH ?

Thanks , :-)


Last edited by WyrTwister; 07/28/17 07:45 AM.

Wyr
God bless
Re: 60R vs 65R [Re: WyrTwister] #4472811
07/28/17 08:01 AM
07/28/17 08:01 AM
Joined: Dec 2008
Posts: 3,116
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline
Joined: Dec 2008
Posts: 3,116
Occupied Virginia

Re: 60R vs 65R [Re: WyrTwister] #4472821
07/28/17 08:08 AM
07/28/17 08:08 AM
Joined: Jun 2003
Posts: 10,534
Illinois
javacontour Offline
javacontour  Offline
Joined: Jun 2003
Posts: 10,534
Illinois
My guess is about a 3% difference in diameter and circumference going up or down 5% in the aspect ratio. Probably well within the existing speedo/odometer margin of error.


network down, IP packets delivered via UPS -BOFH
Re: 60R vs 65R [Re: WyrTwister] #4472825
07/28/17 08:11 AM
07/28/17 08:11 AM
Joined: Jan 2013
Posts: 2,068
Texas
WyrTwister Offline OP
WyrTwister  Offline OP
Joined: Jan 2013
Posts: 2,068
Texas
Thanks , :-)


Wyr
God bless
Re: 60R vs 65R [Re: WyrTwister] #4472859
07/28/17 08:35 AM
07/28/17 08:35 AM
Joined: Jun 2009
Posts: 430
New England
555 Offline
555  Offline
Joined: Jun 2009
Posts: 430
New England
Check the speedo against a GPS speedo. Check before the tire change too.


84 XJ6 M1
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Re: 60R vs 65R [Re: WyrTwister] #4472955
07/28/17 10:12 AM
07/28/17 10:12 AM
Joined: Dec 2014
Posts: 1,294
California
Vuflanovsky Offline
Vuflanovsky  Offline
Joined: Dec 2014
Posts: 1,294
California
I think the possibility exists that your speedo isn't true to begin with so I'd probably worry more about staying within about a 3% diameter increase versus how true the speedo is...I went from a 195/50-16 to a 205/50-16 and with only that marginal increase in diameter it corrected the speedo without the possibility of it effecting the wheel electronics.

I'd agree with the idea of testing it against a GPS. Barring that, I don't see staying within 3% increase in diameter ( which used to be the golden figure ) would effect things much.

Re: 60R vs 65R [Re: WyrTwister] #4472987
07/28/17 10:46 AM
07/28/17 10:46 AM
Joined: Feb 2003
Posts: 3,475
Somewhere in the US
CapriRacer Offline
CapriRacer  Offline
Joined: Feb 2003
Posts: 3,475
Somewhere in the US
Originally Posted By: WyrTwister
Will this make ant significant difference on a little 2015 Chevy Sonic . A few MPH ?

Thanks , :-)


Yes, and don't do it.

If I have this right, your car takes 195/65R15. Going down to a 60 series reduces the load carrying capacity and increases the risk of failure.

Besides, most tire shop we won't let you - for legal liability reasons.


CapriRacer

Visit my web site: www.BarrysTireTech.com
Re: 60R vs 65R [Re: WyrTwister] #4473103
07/28/17 01:20 PM
07/28/17 01:20 PM
Joined: Feb 2014
Posts: 2,596
Canada
Lolvoguy Offline
Lolvoguy  Offline
Joined: Feb 2014
Posts: 2,596
Canada
ON my Focus I was able to go from 205/50/16's to 205/55/16's with no problems.

Speedo is SLIGHTLY out, and tires look a little "meatier" than the last set but the shop had no problems installing them. I just hope I dont' have any clearance issues once I drop the suspension next month by .5 inches.

shrug


06 Lexus IS350- Wife
88 BMW 325is- Mistress
Say "no" to Turbo!
Re: 60R vs 65R [Re: WyrTwister] #4473128
07/28/17 01:54 PM
07/28/17 01:54 PM
Joined: Aug 2003
Posts: 11,012
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 11,012
Buffalo, NY
Originally Posted By: WyrTwister
Will this make ant significant difference on a little 2015 Chevy Sonic . A few MPH ?

Thanks , :-)



It's less rubber, you'll be lower to the ground and tire will rotate more revs per mile. None of it overly significant with this size tire. They'll be a lighter tire and pushing the vehicle lower to the ground *may* increase fuel economy. There's a lot of factors at play though. I might consider it if it was some smoking deal on an excellent tire.


2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)
Re: 60R vs 65R [Re: WyrTwister] #4473140
07/28/17 02:11 PM
07/28/17 02:11 PM
Joined: Oct 2008
Posts: 12,629
The Old North State
Sayjac Offline
Sayjac  Offline
Joined: Oct 2008
Posts: 12,629
The Old North State
Personal anecdote with topic sizing. 01 Civic OEM size 185/65-15. In 2004 Honda went to 195/60-15 on the same vehicle, no major redesign, same generation. First set of tires I purchased for it at Discount Tire was the 195/60-15, in 04 iirc. I preferred the slightly wider tire over the narrower oem. Discount Tire has never questioned it, and I've used the 60 series tire on it since with each DT purchase. Including current, four sets total.

Normally I stick with the oem size, but on that vehicle the 60 series has worked well. That said, your results could be different.

Re: 60R vs 65R [Re: WyrTwister] #4473347
07/28/17 07:11 PM
07/28/17 07:11 PM
Joined: Mar 2008
Posts: 7,311
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,311
USA
what is the reason you are doing this? smile

Re: 60R vs 65R [Re: WyrTwister] #4473371
07/28/17 07:37 PM
07/28/17 07:37 PM
Joined: Jan 2013
Posts: 2,068
Texas
WyrTwister Offline OP
WyrTwister  Offline OP
Joined: Jan 2013
Posts: 2,068
Texas
Sale on the 60R tires .

Thanks , :-)


Wyr
God bless
Re: 60R vs 65R [Re: WyrTwister] #4473463
07/28/17 09:04 PM
07/28/17 09:04 PM
Joined: Mar 2008
Posts: 7,311
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,311
USA
stock size is 195/65-15, right?

Are you trying to go down to 195/60-15? Because if that's what you're trying to do, you can't do that since the new tires will have a lower load index than the original tires no-no

Load index is a rating that corresponds to the amount of weight a tire can carry safely. So you can see why no tire shop will let you do it, and why it's unsafe.

Here are some good tires that you should like, in the correct size:
Goodyear Excellence
Vredestein Sportrac 5

Can you wait a month for the new tires? Because DTD will have their Labor Day sale the last week of August, leading up to labor day. Price is NOT a good reason to change tire size, especially a reasonably-common size like 195/65-15.


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