Tyre Pressure question

FK8jimmy

Member
First Name
James
Joined
Apr 7, 2021
Threads
3
Messages
22
Reaction score
18
Location
England
Vehicle(s)
2017 FK8 Type R
Country flag
Hi all, I've recently changed from the OEM 20's to some 19s. The new tyres are 35 profile, now I've gone down an inch, do I stick to the tyre pressures in the door?
Sponsored

 

shadow

Senior Member
Joined
Jan 19, 2017
Threads
3
Messages
364
Reaction score
230
Location
Philippines
Vehicle(s)
11 STI, 15 CRV, 16 Civic RS Turbo, 18 Civic Type R
Country flag
On the other side of the coin, take a look at the owner's manual.

Honda Civic 10th gen Tyre Pressure question 1619490025281


235/40R18 to 245/30R20 all have the same tire pressures. I would keep it at the same pressure as the stock tires.
 

ForeverCar

Senior Member
First Name
Mike
Joined
Apr 14, 2021
Threads
8
Messages
214
Reaction score
190
Location
WA, USA
Vehicle(s)
2021 Civic Type R and some other cars ;-)
Country flag
Probably not.

Try this calculator - Tire Pressure Calculator
I don’t think this calculator works correctly for our use case. If I understand the information on tirerack correctly, as long as the load rating is same or higher, you stay with the same tire pressures on the “door card”.

I am going from stock size to 245/40/18 and plan on starting with 35psi front and 33 psi rear.
 


tinyman392

Senior Member
First Name
Marcus
Joined
May 21, 2018
Threads
14
Messages
3,265
Reaction score
2,082
Location
Illinois
Vehicle(s)
'18 Civic Type R (RR)
Country flag
On the other side of the coin, take a look at the owner's manual.

1619490025281.png


235/40R18 to 245/30R20 all have the same tire pressures. I would keep it at the same pressure as the stock tires.
Y'all have 18" rims available for your Type Rs? I'm assuming Honda is referring to the winter rims they had once upon a time.
 

.grimace

Senior Member
First Name
Byron
Joined
Nov 9, 2017
Threads
49
Messages
1,796
Reaction score
1,348
Location
Reno, NV
Vehicle(s)
2021 Honda CTR, 2022 Range Rover , 1990 CRX SI
Country flag
your tires will give you the recommended pressures. Can probably go 36 and be fine though
 

shadow

Senior Member
Joined
Jan 19, 2017
Threads
3
Messages
364
Reaction score
230
Location
Philippines
Vehicle(s)
11 STI, 15 CRV, 16 Civic RS Turbo, 18 Civic Type R
Country flag
Y'all have 18" rims available for your Type Rs? I'm assuming Honda is referring to the winter rims they had once upon a time.
The different rim sizes are for other Civic models (1.5L & 2.0L NA).
 


tinyman392

Senior Member
First Name
Marcus
Joined
May 21, 2018
Threads
14
Messages
3,265
Reaction score
2,082
Location
Illinois
Vehicle(s)
'18 Civic Type R (RR)
Country flag
The different rim sizes are for other Civic models (1.5L & 2.0L NA).
This is the hatchback manual right? I didn’t think the 2.0L NA was offered in the hatchback, I may be wrong on that. Footnotes 3, 4, 5, which follow the 18” tire sizes, refer to vehicles with either a 2.0L motor or vehicles with a 20 inch rim; so those wouldn’t apply to the 1.5L motor. With the hatchback manual, the only 2.0L motor should be a Type R.

Edit: WikiPedia says that only 1.5L was offered in US markets (hatchback) while other markets did see a 1.0, 1.5, and 1.6L (diesel) motor options. This is assuming the manual is for a hatchback.

Edit 2: maybe they changed something later on? Though I can’t seem to find a trim of hatch that has a 2.0L NA.
 

shadow

Senior Member
Joined
Jan 19, 2017
Threads
3
Messages
364
Reaction score
230
Location
Philippines
Vehicle(s)
11 STI, 15 CRV, 16 Civic RS Turbo, 18 Civic Type R
Country flag
This is the hatchback manual right? I didn’t think the 2.0L NA was offered in the hatchback, I may be wrong on that. Footnotes 3, 4, 5, which follow the 18” tire sizes, refer to vehicles with either a 2.0L motor or vehicles with a 20 inch rim; so those wouldn’t apply to the 1.5L motor. With the hatchback manual, the only 2.0L motor should be a Type R.

Edit: WikiPedia says that only 1.5L was offered in US markets (hatchback) while other markets did see a 1.0, 1.5, and 1.6L (diesel) motor options. This is assuming the manual is for a hatchback.

Edit 2: maybe they changed something later on? Though I can’t seem to find a trim of hatch that has a 2.0L NA.
It doesn't matter hatch, sedan, 1.5L or 2.0L. The pressure seems to depend on the tire size.
 

MoodySara

Senior Member
First Name
Paul
Joined
Apr 14, 2021
Threads
6
Messages
335
Reaction score
276
Location
NH
Vehicle(s)
2021 Type R - Boost Blue; 2024 Civic Touring - SGP
Country flag
Resurrecting this somewhat old thread - I put my winter tires on the CTR last week.
The tires are 235/45-18. I kept the pressures at the door sticker values - F 35, R 33.
It was awful. The ride was much worse than with the OEM 20" tires/wheels.
Accelerating from a stop I had to try really hard not to spin the wheels.
Cornering wasn't good, either. 90° turns onto the highway produced big slides at speeds much below the summer tire speeds.
This afternoon, I lowered the pressures to F/R 32/30. I'll give that a shot.
The 18" tires have the same load rating at F/R 27/25 as the 20" tires have at 35/33, so there's more room to play if I have to.

(There was also some noticeable torque-steer, but that's another thread.)
 
Last edited:

tacthecat

Senior Member
Joined
Feb 9, 2016
Threads
6
Messages
2,069
Reaction score
891
Location
Cheshire, MA
Vehicle(s)
'12 Civic Si Sedan
Country flag
Chances are it's the tires not the tire pressure - What brand & model? Be careful of rollover onto the sidewall if you go too low or drive too aggressively.
Sponsored

 


 


Top