R18 Disc
R Model Size Guide
Find Your Size
A bike that fits properly is more fun to ride. The guides below offer size suggestion based on height in inches. If you have measuring tape, you may also determine your size by measuring your leg length plus one inch, which is your stand over measurement. For all bikes, we recommend at least 1 inch of space between you and the top tube of the bike. When in doubt, contact our customer service team via email at customerservice@publicbikes.com.
| PUBLIC R18 Disc |
| Frame Size | Rider Height | Effective TT | Standover Height |
| Extra Small - 40cm | 4'10" - 5'2" | 53cm | 28" |
| Small - 44cm | 5'3" - 5'6" | 55cm | 29.5" |
| Medium - 50cm | 5'7" - 5'10" | 57.5cm | 31" |
| Large - 56cm | 5'11" - 6'3" | 60cm | 32.5" |
| PUBLIC R18 Drop Bar |
| Frame Size | Rider Height | Effective TT | Standover Height |
| Extra Small - 44cm | 5'0" - 5'3" | 53cm | 28.5" |
| Small - 49.5cm | 5'4" - 5'7" | 53.5cm | 30" |
| Medium - 52.5cm | 5'8" - 5'11" | 57cm | 31" |
| Large - 57.5cm | 5'11" - 6'3" | 59cm | 32.5" |
*Please note: some riders may be a little outside of these height range recommendations but prefer the feel of a larger or smaller bike. Stand over height measurement is not as important as how the bike geometry feels while it is being ridden.
Shipping and Assembly
Upgrade your everyday ride with the PUBLIC R18 Disc. Featuring updated, more playful geometry, all-weather mechanical disc brakes, and a versatile 2×9 drivetrain, it’s built to confidently handle everything from city streets to steep climbs or country roads.
The R18 Disc blends high-performance design with modern commuter sensibility. Its lightweight Chromoly frame is available in sizes to fit riders from 4’10” to 6’3”, while the Shimano drivetrain and Rapidfire trigger shifters deliver quick, precise gear changes. Mechanical disc brakes provide reliable, confidence-inspiring stopping power in all conditions.
At PUBLIC, function, design, and aesthetics are always thoughtfully considered—and the R18 Disc is no exception. We believe it’s our best-performing commuter, ideal for riders who prefer the comfort and control of a flat handlebar without sacrificing efficiency, performance, or style.
We recommend our unique Ready to Ride shipping option for this model. You’ll receive a 99% assembled bike delivered to your doorstep, professionally tuned and carefully packed by our trained technicians here in Marin County, California.
Technical Specifications
| Frame: | PUBLIC 100% Chromoly steel, with fender and rack braze-ons |
| Fork: | PUBLIC chromoly hi-tensile blend unicrown disc fork, with fender and rack braze-ons |
| Fenders: | Polished silver, 47mm alloy fenders (F/760mm, R/1230mm) |
| Kickstand: | Integrated kickstand plate (kickstand not included) |
| Saddle: | PUBLIC Premium Sport Saddle, 153mm wide, chromoly rails, with brass rivets |
| Grips: | PUBLIC Slender Grip, with alloy clamps |
| Stem: | Alloy, threadless high polish silver, 25.4 clamp (80mm for XS/S/M; 100mm for L) |
| Headset: | 1.125" threadless, steel |
| Pedals: | Wellgo M149 full alloy platform and cage, 9/16" axle |
| Handlebar: | PUBLIC alloy riser bar, 610mm wide, 10 deg backsweep, 20mm rise |
| Seat Post: | Alloy micro-adjust with integrated clamp, 27.2mm |
| Derailleur (F): | Shimano Sora R-3000 (2x9) |
| Derailleur (R): | Shimano Sora R-3000 9-speed |
| Shifter: | Shimano Rapid Plus |
| Crank: | Alloy double crankset 46/34 tooth rings (S: 165mm M: 170 L: 175mm) |
| Cassette: | Shimano 9-speed HG400 11-32 tooth cassette |
| Brakes | Promax mechanical disc brakes with 160mm rotors, with alloy 4 finger lever. |
| Tires: | Kenda Kwest 700x32c |
| Tubes: | Presta, 48mm valve |
| Rims: | Alloy double wall, 32H, 700c |
| Spokes: | 14G Stainless steel |
| Hubs: | Alloy hub with bolt-on quick-release skewer |
| Weight: | 27lbs |
COMPLETE YOUR RIDE
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