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Discussion Starter #1
Hey guys, first time posting on here and was looking for a little information on the STI black diamond XTR tires. I have read some reviews of the tires on here recently but it did not answer some of my questions. I am looking at putting a pair of 26" STI's on a 2013 sportsman 500 but I'm a little worried about how they will perform. I would say 50% of my trail riding is hard packed with occasional mud, and sand, and a few roads the get from trail to trial. The rest of the time the quad is used for working in the woods hauling wood and then every once a while doing some yard work like spraying the yard or hauling sticks/branches. My concern is will these tires be ok for hard packed trail riding and the occasional yard work or am I getting a way to aggressive tire? The price on these tires is really good so it's almost hard to pass up. What are your guys thoughts?
 

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I think for what you are looking to do, they should be fine, but if you're worried about tearing stuff up, maybe look at the ATRs instead of the XTR. The ATR has a 3/4" tread block as opposed to the XTRs 1.25". The ATR does have a semi-aggressive tread and I can tell you from the lap I've taken around my yard, they dig in pretty easily compared to the stcok Carlisle 489s they replaced! This was in an Ohio yard after the top little bit of frost had melted so the ground was squishy to begin with, but it was very noticeable!

Unfortunately, with life and work, it's going to be about another month before I can get any real trail time on them to see exactly how I think they perform. However, with the other tire choices in the size I was shopping, they seemed to be the best available tire for me.

Good luck with your choice.

JJ
 

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Welcome to the forum!
 

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Discussion Starter #4
Thanks for the reply, I was a little concerned about ripping up the yard even though my yard is nothing to write home about. But if the tires ride good on the trails and don't seem to vibrate much when going slow it may be worth it. I haven't been able to find many posts on the trial manners of the tire on hard pack other then review on ATV television, but there are still evaluating them. Anyone use them on hard trails, with occasional mud or sand?

Thanks
 

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Nah proceed ahead!

I like those tires. I run bearclaws but am looking foward to either bearclaw htrs or stis. I think you'll find what you're looking at will work out very nicely along with a smooth, solid biting ride! Overkill maybe the Mudwolves... Enjoy...
 

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I've got the ATRs, in soft ground they will dig into the yard but if your yard is dry and compacted you'll be fine with either ATR or XTRs. they ride great on the hard trails. You might get a little vibration if you're really crawling along with these tires, but on my machine the only time I'm under 5 mph is when coming to a stop or accelerating. So I never notice it. Not even when I'm parking it in the garage where it's tight and needs to be in a specific spot so I've got to go slow.

They've done awesome in the mud and sand that I've gotten them into. I'll have them in snow early next week and will post comments on that when I return.
 

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I run the ATR's on my 500 max and I really like them. They are very smooth and have great all around traction esp in snow and such. I ran them for a bit on my Rene 1000 and at high speeds on hard pack they were very smooth. Hard to beat for the money for a radial tire
 

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Discussion Starter #9
Awesome! I'm glad to hear most of you have had good experiences with these tires, that makes me a little more comfortable with buying them for my riding style. Has anyone had an issue with the tires running a little smaller then what is listed? I read a couple places that the 26" tires really run about 25". I plan on mounting them on some ITP 212 rim's so hopefully they are close to 26" when mounted.

Thanks!!
 

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remember Tire diameter is going to vary depending on the PSI and the weight of the machine. at 7 PSI my 25" ATR's are true to size, and 2.5 that I run them at they are closer to 23.5"
 

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I was concerned about size as I had read the same. I've got mine set to 4 all around and although I haven't measured them, the quad seems to sit a tad higher than what it did with the OEM tires on it set to 5pounds.
 

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I noticed i have to run different pressures front vs. back to get the same height on my 26" xtr's. I'm about 4.5 lbs in the fronts and right around 7 in the rears to get true height. As far as traction...they are awesome. I was crawling though snow in the swamp that was deeper then the top of my floor boards. Certain areas i was pulling mud up too. Idk if i would want the xtr for a yard tire though...the atr would probably be okay for that though.

I am running the 12" ITP Delta wheels. I am happy with this combo and it was cheap through rocky mountain atv.com. Right around $640 with lug nuts and brake pads all around and of course free shipping.

seabee78
 

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I have a set of 27X9s on ITP delta 12" wheels on my RZR. They are about 26.5" tall with 8psi. If I don't like the 9 wide I will go to a pair of 11 wide for the back later this spring. The 11s should be at least 27" tall on a 7" wheel. No riding time yet though. I may get a 2" lift for the RZR too. It drags rocks and mud too much for my liking.
 

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Discussion Starter #14
Well being a little bit smaller than listed is not a big deal, I plan on running the tires around 2.5-4psi so they ride nice. My stock Carlisle tires measure about 24" tall with 5psi in them so if the 26" Diamonds measure around 25" that will be an improvement. thanks again for all your replies!! this is a great website!!
 

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the BDs have a stiff side wall so the pressure will be different than you stock tires as will the ride. So play with the pressures a bit before you settle. I started out with mine at 7 and went down from there.
 

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I'm looking at a set of these for my 500 HO EFI. I was going for Bearclaws but I want to get a radial tire this time. My question is I have the stock tires on 26/8/12 front and 26/11/12 rear. They don't make an 8" front and I know I might need a spacer to not rub the tie rod end with a 26/9/12 front.

What if I went for the stock widths but in the 25" versus the 26"? Is there any advantage I will loose such as top end, etc.. going down to 25's?
 

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I would stay with the 26 inch size. The Black Diamond XTR tires run narrow. The 26x9R-12 should fit fine. I have 27x9-12 on the front of my wife's stock Can-Am 650 max.

Here is a link to them on our web site:

STI Tires Black Diamond XTR tires listed by size

Let us know if we can be of assistance.
 

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also, you can flip the tie-rod end to give you the clearance you need to run a 9" tire with little to no detrimental effect on the steering/suspension.
 

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Just flip it over?
 

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