IRC Boken Plus Tubeless Gravel Tire (Black) (700c) (38mm) (Folding)

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IRC Boken Plus Tubeless Gravel Tire (Black) (700c) (38mm)
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IRC Boken Plus Tubeless Gravel Tire Description:

Supple and durable, the IRC Boken Plus is designed for traction and speed on any surface. The slick center strip provides speed on paved roads, whereas, the small knobs on the sides are great for gravel or wet conditions.


  • Multi-surface tire with a four-part tread for smooth riding performance on any road
  • Smooth center tread for speed on the tarmac
  • Inverted micro-diamond pattern for wet traction
  • Ultra-gummy compound for solid bite on nasty obstacles
  • Tubeless ready


  • Tire Type: Tubeless (Clincher)
  • Bead: Folding
  • Compound | Casing: Ultra-Gummy | Aramid
  • TPI (Threads Per Inch): 117 TPI
  • Puncture Protection: -
  • Color: Black
  • Weight: 435g (700c | 32mm), 575g (700c | 42mm), 590g (650b | 47mm)

Sizing Note: We installed the 700c x 32mm Boken Plus tire on a 23mm internal width rim and found the actual inflated width to be 34.6mm.

This product was added to our catalog on February 27, 2023

Scott McBride
Verified Owner
Monday, Aug 14 2023 (11 months ago)
IRC Boken Plus Tubeless Gravel Tire (Black) (650b) (42mm)
I've put about 100mi on these now with 30mi of gravel and some singletrack. Tires are setup tubeless running 45psi. The tire rolls fast, have predictable handling characteristic in varying conditions, and are easy to mount. I would buy these again.

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