WTB Trail Boss Comp DNA Tire (Black) (26" / 559 ISO) (2.25") (Wire)

Read Reviews
Write a Review
WTB Trail Boss Comp DNA Tire (Black) (26" / 559 ISO) (2.25")

The WTB Trail Boss Comp mountain tire provides superb performance out on the trails that's friendly to your wallet. This speed merchant of a tire sports tight enough tread spacing for full-on, drag-free onslaughts, yet it's blocky and tall enough to really dig in when it comes time to drop out of warp drive. A rounded profile and staggered, supported side knobs keep clamoring for traction even as the trail loses its camber. Top to bottom, this tire will have you owning the trails like a boss.

WTB's proprietary 60A durometer rubber compound offers the ideal mix of rolling efficiency and traction for Cross-Country and trail riding applications. DNA rubber is renowned for being versatile and long lasting.  

Note: This wire bead tire is for tube-type use only. Click here for the tubeless Trail Boss tire.


  • Intended usage: XC/Trail/All Mountain riding
  • Optimal conditions: Dry to damp / Hardpack to loam
  • Knobby pattern provides plenty of straight-line speed and cornering bite
  • DNA rubber compound ensures traction and long tread life
  • Durable casing provides abrasion resistance and reliability
  • Wire bead

Tire Type: Clincher
Bead: Wire
Compound | Casing: DNA | -
TPI (Threads Per Inch): 27 TPI
Puncture Protection: Sidewall
Inflation: 65 PSI Max
Color: Black
Weight: 967g (29" | 2.25"), 913g (27.5" | 2.25"), 900g (26" | 2.25")

This product was added to our catalog on March 12, 2019

Verified Owner
Saturday, Apr 9 2022 (about a year ago)
WTB Trail Boss Comp DNA Tire (Black) (26" / 559 ISO) (2.25")
I was really looking forward to these tires. The product photos are exactly what I wanted. Although I was disappointed once they arrived. The tire was not manufactured correctly and the center row tread is incomplete, with only half of the center row present.

Tire Size Chart

Inch SizingISO / ETRTO
16" BMX / Kids305
16" Recumbent349
18" BMX / Kids355
20" BMX / Kids406
20 x 1-3/4"419
20 x 1-3/8", 20 x 1-1/8"451
22" Wheel Chair501
24" BMX / Kids507
24" BMX Race (Fractional)
24" Road
24" Old Schwinn S-7 Size521
24" Wheel Chair540
24" Old Schwinn S-5 Size547
26" Mountain559
650c Small Road Bike571
27.5 / 650b584
26 x 1-3/8590
26" Old Schwinn S-6597
700c / 29" / 28"622
27" Road (Fractional)630
28" Track Tubular635
36" Big Bike787