Blackbird SR31-15
SKU: 13669906258

Blackbird SR31-15

Sale price$272.25 Regular price$302.50
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Ships within 48 hours · Estimated delivery Jul 8 - Jul 13

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Description

Blackbird SR31-15Rear tire Mounts on 15 wheel 4 ply Dimensions 31 x 31 x 14 (may grow based on rim width) Weight: Uncut 41 pounds, Play cut #1 29 pounds, Play cut #2 31 pounds, Play cut #3 33 pounds Comp cut #1 is 21 pounds, #2 is 24. 5 pounds, #3 is 27 pounds Recommended rim width 10 12 PSI 8 10 16 paddles A great front tire to go with this is the 31 15 tribute or the 32 leed screw. For many reasons the blackbird has quickly become one of our most popular over the

  • Rear tire 
  • Mounts on 15” wheel  
  • 4 ply  
  • Dimensions 31 x 31 x 14 (may grow based on rim width) 
  • Weight: Uncut 41 pounds, Play cut #1 29 pounds, Play cut #2 31 pounds, Play cut #3 33 pounds Comp cut #1 is 21 pounds, #2 is 24.5 pounds, #3 is 27 pounds  
  • Recommended rim width 10”-12” 
  • PSI 8-10 
  • 16 paddles 

A great front tire to go with this is the 31-15 tribute or the 32” leed screw.  For many reasons the blackbird has quickly become one of our most popular over the last few  years in the UTV market and Buggies as well. This is our only tire that comes with 3 paddle  options, for that reason it is a great choice for many UTV’s from stock to highly modified. For  paddle recommendations we have found #1 is what works well on stock machines, once you  get around 200 WHP its time to step up to the #2, and from about 290WHP and 300+ you’ll need the #3 paddle.  

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 13669906258

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4.1 ★★★★★
Based on 2177 reviews
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S
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S
San Leandro, US
★★★★★ 5
Not polyester! Thank you UA!
I never realized shopping for cotton socks in 2024 would be so difficult. Luckily I found these, and all the other Under Armour cotton socks and they are the best. I cannot wear polyester, and these only have like 1%. I didn't realize our cotton is being replaced by polyester, and I don't like it. Bath towels don't work anymore either... I need my cotton socks and towels, I love incandescent light bulbs, I'll always have a gas powered mower and leaf blower. Also butterfinger should've never their recipe. Just sayin...
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Reviewed in the United States on May 4, 2024
J
Verified Purchase
Josie Shmidt
Birmingham, US
★★★★★ 5
Great quality
Size: Large, Color: True Gray Heather Assorted 2 (6-pairs)
The best socks, cotton quality
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Reviewed in the United States on June 28, 2025
M
Verified Purchase
Mom4two
Los Angeles, US
★★★★★ 5
Great sock for everyday
Size: Large, Color: Black/Gray (6 Pairs)
So these are awesome but they are slightly thinner than older versions, shorter too. Just FYI if you a long time UA customer. If you have never had their socks, I love them personally and only like one other brand better. They aren’t overly thick and they allow your feet to breath. I never have sweaty feet in these even in my warm boots. I also like that they don’t cut into my feet or get holes in the toes over long terms. The only reason I’ve thrown these out has been fraying near the ankle or someone (kids) thieving them.
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Reviewed in the United States on December 28, 2019
L
Verified Purchase
LC
Louisville, US
★★★★★ 5
LOVE THEM!!
Size: Small, Color: (001) Black / Black / Castlerock
LOVE! These socks are so comfortable! I wear a 5 in women's and a 3 in big kid shoes. The small fit me perfectly. I see where some say they run small but I can't say that was an issue for me. They are "snug" but thats what you want with a no show sock. I feel they have support vs the ones i used to buy at Walmart. They are very soft! I am actually buying more today and throwing my other ones in the trash!
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Reviewed in the United States on February 18, 2026
L
Verified Purchase
Lucy Mejia
Pawtucket, US
★★★★★ 5
So will not write down your foot
Size: Medium, Color: (001) Black / Black / Castlerock
I love these socks. They have a little bit of gel on the top of the heel for support in your tennis shoes and so your socks don’t write down. Very good quality.
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Reviewed in the United States on May 6, 2026

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