Update: .65G Accel in the rain! 275/40/18 & 245/45/18 on GXP
04-22-2010, 03:43 PM
#44
On The Tree
Thread Starter
Join Date: Jan 2009
Location: Sherwood OR
Posts: 127
Likes: 0
Received 0 Likes
on
0 Posts
I've got 2K miles on them & I still think they are awesome.
I drive alot of back roads by choice and have never rubbed. Stabilitrack used to kick in all the time with the factory tires but I haven't had it kick in yet with these tires.
Another plus is more road feel with the .79" wider tires all around.
No noticable tirewear yet.
04-23-2010, 11:31 AM
#48
TECH Fanatic
Join Date: Apr 2009
Location: nj
Posts: 1,137
Likes: 0
Received 0 Likes
on
0 Posts
04-24-2010, 11:55 AM
#50
On The Tree
Thread Starter
Join Date: Jan 2009
Location: Sherwood OR
Posts: 127
Likes: 0
Received 0 Likes
on
0 Posts
04-24-2010, 06:34 PM
#52
On The Tree
Thread Starter
Join Date: Jan 2009
Location: Sherwood OR
Posts: 127
Likes: 0
Received 0 Likes
on
0 Posts
09-22-2013, 02:50 PM
#54
TECH Fanatic
iTrader: (3)
Join Date: Aug 2009
Location: Orlando, FL
Posts: 1,392
Likes: 0
Received 0 Likes
on
0 Posts
Might I add that this setup (275/40-18 front and 245/45-18 rear) retains the factory staggered difference of 30mm, which is a good thing. The sidewall height is near identical as well.
Stock:
Front: 255/45-18 = 114.75mm sidewall height
Rear: 225/50-18 = 112.50mm sidewall height
30mm difference in tire width.
New Setup:
Front: 275/40-18 = 110.00mm sidewall height
Rear: 245/45-18 = 110.25mm sidewall height
30mm difference in tire width.
I recently put on 275s up front and I can concur that torque steer is pretty much nonexistent [at stock power]. I'll be putting on some 245/45-18s out back this week.
All tires are Sumitomo HTR Z III. The cheapest place to get these are from Tire Rack: $146 each for 275/40-18 and $129 each for 245/45-18.
Another tire to look into is the ACHILLES Atr Sport. In 275/40-18, they are $79.57 each from onlinetires.com. However, they're on backorder for a good 7-8 weeks. 245/45-18 in the same tire is $75.53 each.
As DavidGXP has proven before: 275/40-18 does not rub up front when lowered.
EDIT: I mounted the 245/45-18 on the OEM rear wheels out back and recently went through some heavy rain; I really do like these Sumitomos.
One reason why I chose this tire was because of the following from the manufacturer (in bold):
Stock:
Front: 255/45-18 = 114.75mm sidewall height
Rear: 225/50-18 = 112.50mm sidewall height
30mm difference in tire width.
New Setup:
Front: 275/40-18 = 110.00mm sidewall height
Rear: 245/45-18 = 110.25mm sidewall height
30mm difference in tire width.
I recently put on 275s up front and I can concur that torque steer is pretty much nonexistent [at stock power]. I'll be putting on some 245/45-18s out back this week.
All tires are Sumitomo HTR Z III. The cheapest place to get these are from Tire Rack: $146 each for 275/40-18 and $129 each for 245/45-18.
Another tire to look into is the ACHILLES Atr Sport. In 275/40-18, they are $79.57 each from onlinetires.com. However, they're on backorder for a good 7-8 weeks. 245/45-18 in the same tire is $75.53 each.
As DavidGXP has proven before: 275/40-18 does not rub up front when lowered.
EDIT: I mounted the 245/45-18 on the OEM rear wheels out back and recently went through some heavy rain; I really do like these Sumitomos.
One reason why I chose this tire was because of the following from the manufacturer (in bold):
The HTR Z III (High Technology Radials-3rd generation) is Sumitomo's Max Performance Summer tire developed for sports cars, sporty coupes and high performance sedans. It is designed to showcase Sumitomo's technical resources by providing high speed handling stability along with traction on dry and wet roads. Like all summer tires, it is not intended to be driven in near-freezing temperatures, through snow or on ice.
The Sumitomo HTR Z III features a silica-enhanced tread compound molded into a sophisticated, 5-rib, asymmetric tread design. Large outboard shoulder and intermediate tread blocks along with continuous center and inboard intermediate ribs provide responsive handling, high-speed stability and dry road traction. The inside shoulder is linked by another continuous circumferential rib that enhances wear quality to help reduce noise throughout the life of the tire, especially on vehicles with independent suspensions and alignment settings that specify negative camber. Straight and wide circumferential grooves along with long, sweeping lateral grooves pump water from under the tire’s footprint to increase hydroplaning resistance and wet traction.
The Sumitomo HTR Z III radial features a high-rigidity construction consisting of wide steel belts reinforced by spirally wrapped polyamide that stabilize the tread area to enhance handling and high-speed capability. Its polyester cord body and hard rubber sidewall fillers help blend uniform ride quality with steering response and lateral stability.
The Sumitomo HTR Z III features a silica-enhanced tread compound molded into a sophisticated, 5-rib, asymmetric tread design. Large outboard shoulder and intermediate tread blocks along with continuous center and inboard intermediate ribs provide responsive handling, high-speed stability and dry road traction. The inside shoulder is linked by another continuous circumferential rib that enhances wear quality to help reduce noise throughout the life of the tire, especially on vehicles with independent suspensions and alignment settings that specify negative camber. Straight and wide circumferential grooves along with long, sweeping lateral grooves pump water from under the tire’s footprint to increase hydroplaning resistance and wet traction.
The Sumitomo HTR Z III radial features a high-rigidity construction consisting of wide steel belts reinforced by spirally wrapped polyamide that stabilize the tread area to enhance handling and high-speed capability. Its polyester cord body and hard rubber sidewall fillers help blend uniform ride quality with steering response and lateral stability.
Last edited by GXP25; 09-28-2013 at 03:07 PM. Reason: Added some more info.
