Does size matter? Spare tire (doughnut) question

A General Discussion forum for cars and other topics, and a great place to introduce yourself if you are new to NICO!
User avatar
Rogue One
Administrator
Posts: 7942
Joined: Tue Jun 14, 2011 10:15 pm
Car: 2011 Nissan Rogue SL
2012 Nissan Rogue SL
2022 Honda Pilot SE
2025 Honda CR-V Sport L
Location: Florida, USA

Post

One of my sisters has a vehicle that's missing the compact spare tire. The vehicle manual says the size of the compact tire is T130/80/15. She can get her hands on a (free) T125/70/15, which I'll assume really shouldn't be an issue, but thought I'd get some input.


User avatar
PapaSmurf2k3
Site Admin
Posts: 19000
Joined: Thu Nov 21, 2002 3:20 pm
Car: 2017 Corvette, 2018 Focus ST, 1993 240sx truck KA Turbo.
Location: Merrimack, NH

Post

It'll be 3.5% off in a bad way. What are the sizes of the factory tires?
I wouldn't really want to go smaller than the factory spare. They might have already calculated that the one from the factory is as small as you want to go before you risk differentials, etc.

User avatar
szh
Posts: 15932
Joined: Tue Jul 23, 2002 12:54 pm
Car: 2018 Tesla Model 3.

Unfortunately, no longer a Nissan or Infiniti, but continuing here at NICO!
Location: San Jose, CA

Post

One critical thing: regularly check these donut spare tire pressures and adjust - I do it every few months (nice to have a good 110V inflator at home for this purpose)!

They generally need to be kept at 60+ psi (depending on make/manufacture).

Because, people, for some unknown reason(!), feel comfortable driving at highway speeds on these spares rather than the recommended 50mph or less!

And, if these spare tires are under-inflated (often the case!), they could easily overheat and blow apart. Then, the driver will be kinda dead when the car goes out of control. :eek:

Z


Return to “General Chat”