31 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSumitomo HTR ZIIIs discontinued!
Leading reported evidence
Replace by htr z5
Performed · outcome unconfirmed
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0
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1
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Suggestion
Note:Tires exposed to temperatures of 20 degrees F (-7 degrees C) or lower must be permitted to gradually return to temperatures of at least 40 degrees F (5 degrees C) for at least 24 hours before they are flexed in any manner, such as by adjusting inflation pressures, mounting them on wheels or using them to support, roll or drive a vehicle.
Leading evidence: 'Replace by htr z5' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'little easier' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Adjust inflation pressures, mounting them' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed
That is the tire I run 295 on 18x11, rim yields 12" tread on the ground.
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Performed · outcome unconfirmed
In fairness, I had used Z3s on the rear and some brand I have never heard of (Rexall or something like that) on the front, so I may not be the best source, but I can say it made a night and day difference!
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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Suggestion
Note:Tires exposed to temperatures of 20 degrees F (-7 degrees C) or lower must be permitted to gradually return to temperatures of at least 40 degrees F (5 degrees C) for at least 24 hours before they are flexed in any manner, such as by adjusting inflation pressures, mounting them on wheels or using them to support, roll or drive a vehicle.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suspected cause
The lower grip is probably a little easier on the m96's oiling system, session after session.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Adjust inflation pressures, mounting them
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Note:Tires exposed to temperatures of 20 degrees F (-7 degrees C) or lower must be permitted to gradually return to temperatures of at least 40 degrees F (5 degrees C) for at least 24 hours before they are flexed in any manner, such as by adjusting inflation pressures, mounting them on wheels or using them to support, roll or drive a vehicle.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
31 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
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Generation: 20261027T075545Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
ZIII's were good, cost effective street tires. Notice I said "street tires", not track tires or best hi-grip street tires, so let's not turn this into a Sumitomo-bashing thread. Looks like the Z5's are even less expensive (more cheap?) than the ZIII's. If the Z5's are as good a street tire as the ZIII's then it might be a good replacement.
I've used them on the track before and for an intermediate driver they weren't awful.
Two things I didn't like about them though is that they had pretty rounded shoulders making the tire appear smaller and also they tended to flat-spot if you let them sit for a couple of days.
But in terms of bang for the buck, excellent buy!
That is the tire I run 295 on 18x11, rim yields 12" tread on the ground.
Did tire rack confirm no 295 or just not yet available.
I have had a couple sets. They are a great value for the grip/wear level
I actually got a set of the Z5's last month. I've put about 1K miles on them since. For all 4 tires, it was about $520, plus I'm getting another $50 back in a rebate check via Tire Rack. I cannot compare them to the III's, but I think they're an excellent tire, especially for the price. I don't track (yet), but for street driving, these tires are great! I'm not one of those guys that'll spend $500 more on something, for a 5% gain in grip or whatever. I'm not a race car driver. I just like to have fun, and drive my car as many miles as I possibly can.
Before these, I had Pilot Sport's, and I liked those also. I bought my car with 90K miles, and Pilots were in good shape. I put 25K miles on them, and I could've managed a few more thousand, if I did not run over a nail. I expected I'd be replacing my rears every 10K miles, but my rears were still in good shape after 25+K miles. My true test will be to see how the Z5's are looking after 20K miles. If they last as long as the Pilot's then I'll be happy. If they wear out in 10K, then the money savings is not there any longer.
I have ZIIIs on mine, have held up well, even thru a track day weekend. My instructor was surprised as well. They're old now though even with lots of tread left, so Sport 2s are on my shopping list this fall/winter before the next HPDE event...
Funny that a ton of gt3 drivers use sumitomos for their street tires and people here are scoffing at them. I think they're a fine street tire, and at the price point, I could burn through a set every year and not think twice about it. Different strokes for different folks.
IMO, night and day. Turn in so much more precise. I don't daily drive mine. It's a precision machine I enjoy and try to master. Tires on my bicycles and cars are one place I don't skimp. 😎
Update
Tire rack now has 295Rx18 in stock with more coming 9/6.
BUT !
This a a copy paste of description, big change in compound.
For us who live in four season areas, Upstate New York for me, and my detached garage is not heated, they have the "cold weather warning".
Unless we here in the Northeast heat our garages, the tires would have to come off and be stored inside.
This is a game changer for me.
Description
Sizes
Specs
Warranty
Lea en espa�ol
The HTR Z5 is Sumitomo's Ultra High Performance Summer tire designed for the drivers of sports cars, sporty coupes and performance sedans looking for responsive high-speed handling and reliable traction in warm, dry and wet conditions. Like all Ultra High Performance Summer tires, the HTR Z5 is not intended to be serviced, stored nor driven in near- and below-freezing temperatures, through snow or on ice.
An aggressive, summer compound is molded into the HTR Z5's asymmetric, five-rib tread pattern. A continuous center rib aids stability and improves steering response, while the substantial shoulders improve lateral grip. Notches in the intermediate and center ribs combine with the tread compound for traction in wet conditions, and the four wide, circumferential grooves and lateral shoulder grooves evacuate standing water from the footprint for hydroplaning resistance.
The internal construction of the HTR Z5 consists of a two-ply, polyester casing supporting two high-rigidity steel belts. A full-width, nylon reinforcement ply improves high-speed stability, and a high-modulus bead insert strengthens the sidewall to aid handling.
Note:Tires exposed to temperatures of 20 degrees F (-7 degrees C) or lower must be permitted to gradually return to temperatures of at least 40 degrees F (5 degrees C) for at least 24 hours before they are flexed in any manner, such as by adjusting inflation pressures, mounting them on wheels or using them to support, roll or drive a vehicle.
Bill, that's not nice
Wouldn't you enjoy January & February with a week straight of below zero temperatures.
Maybe a foot of snow and ice to go through
I park mine all winter, so that wouldn't concern me. The prior version tended to flat spot, especially when cold, more pronounced as they wear, so this seems like more of the same.
Mine is parked all winter also.
Car cover and battery tender.
But garage does not have heat, the description, at least the way I understand it, exposed to cold could cause problems, then not covered under warranty.
HTR ZIII, didn't have this, if I remember correctly, that was one of the reasons I originally went with them.
PS2 also has cold weather statement
And yes, the HTR ZIII tires get flat spots after 4-5 days, rolls out after 10 minutes of driving
As I read the warning, it just means if parked in cold conditions you can't use the tires in any way until they warm up gradually. Many UHP and Max Performance tires are this way.
I have a set of all season UHP tires for early spring and late fall when it is too cold to run summer tires for this very reason.
I just did the same actually. Put a new set of Z5s on and promptly did a 1000 mile road trip. In fairness, I had used Z3s on the rear and some brand I have never heard of (Rexall or something like that) on the front, so I may not be the best source, but I can say it made a night and day difference!
I have almost zero chance to track my 996 so these are perfect tires. Loving them so far.
Bummer, these were a good cheap option to burn through. My only complaint with these on my last car as a daily or as a DE tire were the slightly mushy reactions and less than optimal feedback (subjectively only slightly worse than the much more $ Conti ECS). If the new ones fix that criticism, they'll be a great option. You can't win a DE, so I really don't understand the point of throwing on the stickiest possible tire for a non-competitive event. I prefer to save the expensive sticky stuff for autox, trackcross, etc and burn through tires like Sumis with impunity at DE. The lower grip is probably a little easier on the m96's oiling system, session after session. Not a bad thing. Learning to drive a the limit with the actual speed being a few mph lower isn't a bad thing either. Makes for slower accidents :B
RIP
great tire for the money. the firehawk indy 500s are a little better it seems, but prices on those went WAY up with their popularity. real shame.
hope the news ones chunk less on track, and bonus points if they're as cheap and fast
Not a good review from Tirerack:
https://www.tirerack.com/tires/tests...y.jsp?ttid=247
Oddly, the FK510 seems to have done much better, and they are made by the same company.
