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#1
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Tire pressure for 225/45/17
Hi guys. I have done tons of research, and can't come to a solid conclusion. I have 07 STi bbs wheels on my SVX, and I want to know the optimal tire pressure to run in them. They are Hancock V12's. The max rating is 50 psi, so I Just put them around 45. The door panel (I realize this should be taken with a grain of salt, considering I don't have the stock tire size) said 29/32 I think? So I put them at that. Much too soft. I will be putting them at 34f/32r today after work. Is that a good pressure? I want the best fuel economy and performance. I hate the squishy feeling low pressure gives around corners, almost like I'm peeling the tires from the rims. I know this is one of those topics such as synthetic or regular oil, etc., but I would like to hear what you guys run, mostly from those that have STi wheels.
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1992 Pearl White LS Owned since 2009 175k Miles STi Airlift Performance air suspension 2005 WRX manual swap Rear wheel drive K-Staff front bumper Delta Speed side skirts JDM clear corners Smallcar grille Subaru XT steering wheel Subaru XT shift knob First bagged SVX in the world Worlds first SVX on air suspension. Custom made (by myself) spare tire subwoofer. |
#2
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Re: Tire pressure for 225/45/17
Hi,
I run 36F/33R on 225/45/17 Nitto NexGens on the STi BBS wheels, good compromise of ride and handling.
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Cheers! Gordon 1997 Ebony #308 113k "The Black Diva"SOLD 1992 Black over Liquid Silver 152k SOLD 1992 Ebony 251k 444 SOLD 1999 Silver SLK230 134k SOLD 1997 Green Outback 137k SOLD 2013 Honda Accord I4 SOLD 2015 Subaru Crosstrek 30k 2018 Tesla M3 30k |
#3
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Re: Tire pressure for 225/45/17
It's really up to you. My 245/40/17 General Exclaims are horridly mushy, so I run 40/35 to compensate.
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Chris 92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping 2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos 2008 Subaru Legacy Spec B - Diamond Grey Metallic - Sold 2020 Ram 1500 Longhorn - Red Pearl |
#4
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Re: Tire pressure for 225/45/17
When I had BBS wheels on my car, I ran within 5lb of max tire pressure and kept the % difference between front and rear consistent with the badge on the door. The badge on the door, even for stock wheels/tires is for comfort and imo, is much too mushy.
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#5
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Re: Tire pressure for 225/45/17
On stock rims and regular size wheels (Toyo Proxes C1S) my car kept dancing a lot with more pressure than 33/29. Driving was more exciting but mostly due to the element of danger, I think
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I got my girl, I got my glass, I got my car and I'm ready to f... |
#6
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Re: Tire pressure for 225/45/17
Having read most of the postings on this forum going back years, this has been a long-time debate.
I've got that size tire on STi 17" wheels and have been running them at the OEM recommended pressures. I wasn't sure what else to use, but I didn't like the feel either -- mostly because of the tram lining the tires were doing. They're Bridgestone Potenza RE 070's. I considered going with the recommended pressures for the STi, but even on those forums, there no consensus, and besides, they're not the same car. Anyway, as of today, I'm trying 38F and 33R, which is the same ratio as OEM, to see if a stiffer ride feels any better.
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Rod. '97 Ebony LSi #426, CDM (1 of 51 in '97), 185k km, rebuilt engine & transfer case; 22mm Bontrager RSB; 4300k HID 9006 bulbs SOLD '92 Ebony LS-L #6851, USDM (sold) '08 Forester (wife's) '06 STi (traded for the Forester) '94 Legacy wagon (sold) |
#7
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Re: Tire pressure for 225/45/17
After some around town and highway I'm much happier with the feel at 38F and 33R than the OEM recommended 33/29. Handling is crisp and no more tram lining.
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Rod. '97 Ebony LSi #426, CDM (1 of 51 in '97), 185k km, rebuilt engine & transfer case; 22mm Bontrager RSB; 4300k HID 9006 bulbs SOLD '92 Ebony LS-L #6851, USDM (sold) '08 Forester (wife's) '06 STi (traded for the Forester) '94 Legacy wagon (sold) |
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