Replacement of 1 or 2 car tyres?

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rayonline

1736 posts

Uber Geek
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#240943 3-Oct-2018 16:10

Someone I know overseas. 2 nails slashed one tyre. 1 tyre required or 2? She has been told 2 is needed. 2 tyres - because one used and one new won't balance?

The spare tyre is a "space saver" temporary tyre.

Cheers.

wellygary

8810 posts

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#2100883 3-Oct-2018 16:18

Generally if tyres are reasonably worn replace them both,

Having a single new tyre with full tread while the corresponding one is well worn is really just an invitation for a nasty accident when braking hard in the wet....

nzkc

1634 posts

Uber Geek
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#2100889 3-Oct-2018 16:31

Definitely two tyres. Unless the other side is basically new (i.e. less than a few months old).

Oblivian

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ID Verified

#2100897 3-Oct-2018 17:21

Directional performace tyres must be replaced in pairs (or at the least have the same construction type per axel side and cant be mixed). Their roll resistance differs to standard conventional radial tread pattern. If they're superseeded patterns too much may be stuck in a tricky spot.

But in general you want the same wear and compound where possible. You are relying on the thing that sticks you to the road - and stops you when needed. Wearing 1 jandal and 1 sneaker on each foot is a little silly when out running :P

scuwp

3927 posts

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#2100910 3-Oct-2018 18:09

Oblivian:

Wearing 1 jandal and 1 sneaker on each foot is a little silly when out running :P

Quote of the week, and bang on the money

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elbrownos

109 posts

Master Geek
+1 received by user: 40

#2103205 8-Oct-2018 10:44

Of course the tyre shop would say she needs to replace both, but I wouldn't dream of doing it.

Having a "balanced pair" is a red herring. The variation in performance between a new tyre and one at its tread limit is minimal. Besides there are dozens of other factors at play which are more significant than the state of wear.

plas

456 posts

Ultimate Geek
+1 received by user: 59

#2103244 8-Oct-2018 11:29

Applies to NZ, but yeah makes sense to me.

https://vehicleinspection.nzta.govt.nz/virms/in-service-wof-and-cof/general/tyres,-wheels-and-hubs/tyres-and-wheels

Reasons for Rejection

Tyres

1. Tyres on the same axle are not of the same:

a) size designation (see Table 10-1-3), or

b) carcass type (ie mixed steel ply, fabric radial ply, bias/cross ply, run-flat), or

c) tread pattern type (mixed asymmetric, directional, normal highway, traction , winter tyre tread (Figure 10-1-3)).

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rayonline

1736 posts

Uber Geek
+1 received by user: 51

#2103246 8-Oct-2018 11:35

elbrownos:
Of course the tyre shop would say she needs to replace both, but I wouldn't dream of doing it.

Having a "balanced pair" is a red herring. The variation in performance between a new tyre and one at its tread limit is minimal. Besides there are dozens of other factors at play which are more significant than the state of wear.

She did end up getting 2. They were the exact same as the old ones.

ObidiahSlope

260 posts

Ultimate Geek
+1 received by user: 66

#2103248 8-Oct-2018 11:37

This Aussie bloke on YouTube has some helpful advice;

https://www.youtube.com/watch?v=dbMti7VQC1k

Obsequious hypocrite