Welcome to the North American Subaru Impreza Owners Club Thursday December 25, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Click here to visit TireRack
Tire & Wheel Forum sponsored by The Tire Rack

Losing traction? Need new tires?
Click here to visit the NASIOC Upgrade Garage...
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Tire & Wheel

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-28-2004, 12:26 AM   #1
balajc
Scooby Specialist
 
Member#: 15393
Join Date: Feb 2002
Chapter/Region: Tri-State
Location: Nassau County, LI
Vehicle:
MY00 2.5RS Coupe 5MT
Silverthorn Metallic

Have a Nice Day? what if I got a flat while on 215/45/17?

I recently put snow tire (stock size) on the OEM wheels on the RS...so when summer comes, I will be buying Rota with 215/45/17 ES100...

since 215/45/17 is roughly 1.5% smaller (in the case of ES100), what if I get a flat? I am not stupid enough to put the spare on the rears but would there be any bad effect if I put it on the front?

car is 2000 RS

what do people who run 215/45/17 in the summer usually do???
* Registered users of the site do not see these ads.
balajc is offline   Reply With Quote
Old 01-28-2004, 01:07 AM   #2
Penphoe
Friendly Neighbourhood
Moderator
 
Member#: 269
Join Date: Sep 1999
Chapter/Region: VIC
Location: Burnaby, B.C., Canada
Vehicle:
2005 ABP LGT LTD BP6
00 Impreza RS GM6 RIP

Default

Hope I don't get a flat!

1.5% won't be that bad of a difference for a short period of time. it's not like you're going to be driving like that for the rest of the year or anything. Think of it as incentive to get your tire replaced.

I'm in a sticker spot. I have Subaru 4-pots up front and I don't know if my spare doughnut fits over them! If I get a flat in the front, I may have to do 2 wheel changes - one to remove a good tire in the back and put the spare there, and then the 2nd change to put the "good one" back up front.

We'll see - I'll test my doughnut spare when I swap my winter wheels back to summers.

LaterZ!
Darren!!
Penphoe is offline   Reply With Quote
Old 01-28-2004, 01:48 AM   #3
DDMan
Scooby Specialist
 
Member#: 11221
Join Date: Oct 2001
Location: Rocklin, California
Vehicle:
2002 2.5 RS
Black as Midnight!!!

Default

Actually, I think you would be in BETTER condition than most.

Spare tires are smaller than STOCK sized tires (yes...even in our cars, they are smaller, which is why they put a 50 mile limit on them)...so you should be pretty damn safe with a spare for a day or 2.
DDMan is offline   Reply With Quote
Old 01-28-2004, 02:41 AM   #4
kenchan
Scooby Guru
 
Member#: 15106
Join Date: Feb 2002
Default

btw, for those with aftermarket wheels, make sure you
carry the factory lugs with you in your trunk. some of those
aftermarket lugs are too small to hold the donut.
kenchan is offline   Reply With Quote
Old 01-28-2004, 06:16 PM   #5
balajc
Scooby Specialist
 
Member#: 15393
Join Date: Feb 2002
Chapter/Region: Tri-State
Location: Nassau County, LI
Vehicle:
MY00 2.5RS Coupe 5MT
Silverthorn Metallic

Default

I know the spare is narrower (135/70/16) than the stock 205/55/16 but I dont know if the rolling circumference is close...I dont have the size calculator with me right now

So it seems like I would be fine putting the donut on the front then. And the suggestion of keeping facotry lugs in the car is a good idea
balajc is offline   Reply With Quote
Old 01-28-2004, 11:43 PM   #6
DDMan
Scooby Specialist
 
Member#: 11221
Join Date: Oct 2001
Location: Rocklin, California
Vehicle:
2002 2.5 RS
Black as Midnight!!!

Default

Quote:
Originally posted by balajc
I know the spare is narrower (135/70/16) than the stock 205/55/16 but I dont know if the rolling circumference is close...I dont have the size calculator with me right now

So it seems like I would be fine putting the donut on the front then. And the suggestion of keeping facotry lugs in the car is a good idea
Alright, I just did that calculation....and its pretty amazing.

Between a stock tire and the spare donut that sized the differences are:

Height (diameter) is 1.44"
Rollout (circumfrence) is 4.5"
At 60MPH, the donut is only traveling at 57mph.

Personally, that is why they put a 50 mile limit on our cars.
DDMan is offline   Reply With Quote
Old 01-28-2004, 11:57 PM   #7
eyeballs
Scooby Specialist
 
Member#: 31629
Join Date: Jan 2003
Chapter/Region: South East
Location: Gainesville, GA
Vehicle:
2012 Mazda 2
Spirited Green

Default

Thanx for those of you who mentioned the factory lugs. I just swapped out for aftermarket and did not even think about the spare. I think I'll go throw 5 of the stock lugs in the car right now before I forget. While I'm at it I also need to kick myself in the a$$ for driving around with dead weight I couldnt even use.

Someone tell me I'm not the only one who forgot about this.
eyeballs is offline   Reply With Quote
Old 01-29-2004, 12:08 AM   #8
Orson
Scooby Specialist
 
Member#: 25254
Join Date: Sep 2002
Chapter/Region: MWSOC
Location: Livonia, MI
Vehicle:
2003 WRX wagon

Default

I wouldn't worry about it too much. At the very worst, you can let a little air out of your spare and drive extra slow. Looking at the spare, I somewhat doubt that it has the exact same rolling radius as even the stock 205/55R16. Plus remember that in the end, it is the wheel speed that matters (with respect to the differential) and that is a function of a lot of things, not just static radius.

I carry a full size 205/55R16 as a spare and I run it with only 28psi to match my 215/45R17.
Orson is offline   Reply With Quote
Old 01-29-2004, 03:02 AM   #9
theviv
Scooby Newbie
 
Member#: 22689
Join Date: Aug 2002
Vehicle:
2002 WRX wagon
silver

Default

Quote:
Originally posted by Orson

I carry a full size 205/55R16 as a spare and I run it with only 28psi to match my 215/45R17.
Doesn't tire pressure have nothing to do with circumference of the tire? Whether your tire is at 28psi or 32psi it shouldn't make a difference.

Unless the extra psi actually stretches the outside of the tire significantly, I'm at a loss as to why it should matter.

Right? Somebody back me up on this....
theviv is offline   Reply With Quote
Old 01-29-2004, 03:35 AM   #10
Penphoe
Friendly Neighbourhood
Moderator
 
Member#: 269
Join Date: Sep 1999
Chapter/Region: VIC
Location: Burnaby, B.C., Canada
Vehicle:
2005 ABP LGT LTD BP6
00 Impreza RS GM6 RIP

Default

Quote:
Originally posted by DDMan
Alright, I just did that calculation....and its pretty amazing.

Between a stock tire and the spare donut that sized the differences are:

Height (diameter) is 1.44"
Rollout (circumfrence) is 4.5"
At 60MPH, the donut is only traveling at 57mph.

Personally, that is why they put a 50 mile limit on our cars.
No, I think the 50mi limit is because the tread is so thin on the spare doughnut, that any long-term driving will cord the tire and cause it to fall apart! I'm not kidding. It's meant just to get you to the nearest service station to get the tire replaced - in theory of course.

Which begs the question, how FAR have people actually driven on the doughnut? Wouldn't it be funny if you wanted to go super "light" and ran 4 doughnuts instead of regular tires and wheels?

LaterZ!
Darren!!
Penphoe is offline   Reply With Quote
Old 01-29-2004, 10:37 AM   #11
balajc
Scooby Specialist
 
Member#: 15393
Join Date: Feb 2002
Chapter/Region: Tri-State
Location: Nassau County, LI
Vehicle:
MY00 2.5RS Coupe 5MT
Silverthorn Metallic

Default

the spare size 135/70/16 is 5.78% smaller than stock

man, you guys were right I would be better off with 215/45/17
balajc is offline   Reply With Quote
Old 02-04-2004, 07:32 PM   #12
Brest Phan
Scooby Newbie
 
Member#: 29052
Join Date: Nov 2002
Location: Event Horizon
Vehicle:
08 Evo X
03 WRX sold not forgotten

Default

I drove from tx to ca once on a doughnut spare in a toyota tercell....
Brest Phan is offline   Reply With Quote
Old 02-04-2004, 07:40 PM   #13
Coati
Scooby Guru
 
Member#: 9106
Join Date: Aug 2001
Chapter/Region: SCIC
Location: Wanted a Levorg
Vehicle:
2015 FXT - DGM
2008 STI - Aspen White

Default

Quote:
Originally posted by Orson
I wouldn't worry about it too much. At the very worst, you can let a little air out of your spare and drive extra slow.
I wouldn't do that if I were you. An underinflated mini-spare is more likely to self-destruct while you're driving.

Back in one of the late 1980's-era One Laps, there was a car that did it on mini-spares all around. In answering concerns about the spares' safety, they mentioned that high pressures were what they were using to help them last.
Coati is offline   Reply With Quote
Old 02-04-2004, 10:56 PM   #14
Patrick Olsen
NASIOC Supporter
 
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
QuickSilver Metallic

Default

Quote:
Originally posted by Coati
I wouldn't do that if I were you. An underinflated mini-spare is more likely to self-destruct while you're driving.
Exactly right. They have "INFLATE TO 60PSI" on the sidewall for a reason! That's an awful small tire trying to carry the weight of the car, so you need the higher pressure.

And Darren, there's no worry about the tread wearing out in only 50 miles. I've driven for days at a time on a spare before with no problems. I just installed mine today ( ) and yeah, it doesn't have the full tread depth of a "real" tire, but it's way more than enough to last 50 miles.

Pat Olsen
'97 Legacy 2.5GT sedan
Patrick Olsen is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rota Attack 17x7.5 on 215-45-17 - your impressions? smackedownz Tire & Wheel 4 05-16-2005 08:34 PM
What tire pressure recommended for street with 712's 215/45/17 on a 7.5 vapore0n Brakes, Steering & Suspension 2 04-14-2003 07:10 PM
Tire circumference Q for math whizzes. 26.2 miles on 215/45/17 WRX is actually... gtguy Brakes, Steering & Suspension 9 09-27-2002 04:58 PM
17'' oz sl's on 215/45/17 boysetsfire Brakes, Steering & Suspension 4 09-22-2001 03:06 PM
reccommended tire pressure on 215/45/17 for WRX GDA Brakes, Steering & Suspension 1 06-08-2001 07:49 AM


All times are GMT -4. The time now is 12:40 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.