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.pro.
| 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.
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.
| 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 |
$54.99
$145.00
$19.99
$39.99
Overall rating: 4.6153846 / 5 from 26 reviews.
The PUBLIC R18 Disc offers a smooth ride and a great overall look, making it a top choice for commuters and weekend adventurers. Its lightweight Chromoly frame, updated cockpit, and Shimano Sora drivetrain ensure high performance and comfort. The bike's design includes reflective pinstripes, premium grips, and removable alloy fenders, enhancing both aesthetics and functionality.
Review topics: ["fit","size","quality","problem","looks","color","finish","value","customer service","bike","ride","seat","brakes","fenders","gears","saddle","rides","hills","bicycle","handlebars"].
"5 star bike for under $1k. The only facet of this setup I couldn't appreciate was the burlap canvas saddle (ouch). Every other feature made this bike a steal for the sale price. I appreciated the professional setup at a local bike shop as well. Thanks Public!"
"Great bike for the money. Looks good with a retro feel. Love the "cobalt" color, actually more of a deep teal"
"Bought this for my daughter and she is enjoying her ride to school so much more these days."
"Great bike"
"What a smooth ride. Absolutely love this bike and it doesn’t hurt that she’s super pretty too!"
"I really like this bike. It arrived at my house in great condition. The bike was tuned when I put it together it switched through the gears like butter. Overall very satisfied."
"I've been riding this bike for about 4 years on the East Bay Bike Path in Prov. RI. I bought it specifically for the bike path. I changed up all the touch points, peddles, seat, handlebar, grips which is what I do with every bike. I like riding upright and it is comfortable. I added a Brooks springer saddle (comfort) and all the bells and whistle desired for city riding. I ride it 20 miles a day every day so I wanted 2 water bottles. It's a perfect bike for my use. It climbs hills very well, is sturdy yet not heavy. I love the rapid fire shifter and change gears constantly. You can change gears without your hand leaving the bar grips still feeling secure. I hammer it up the hills and beyond tightening a few bolts here and there no issues. It's quick on the start and I can easily swing and reposition the bike when stationary at a set of lights, cars block your path and what not. I did live in a third floor apartment and its light enough to throw on your shoulder and huff it up the stairs. I do recommend this bike. Its all around a great bike."
"Finally found a nicely designed bike small enough for a shorty like me. Purchased the cream color when it was on sale. I've purchased other Public bikes which were shipped/delivered by UPS (inside apt bldg) and they were quick (2-3 days from CA to Seattle) in excellent condition. This fully assembled bike was shipped/delivered using "Kitzuma" by a guy in a yellow Penske rental boxcar truck without the pedal wrench and 3-way allen wrench (I have extras so not a problem for me)."
"Great bike. Has everything I desire in a recreational road bike. Rides great. I got the R18 Disc bike with the Ready to Ride shipping option. The bike has a nice clean and active appearance without being overstated. I especially like its complementing cream colored frame and chrome colored fenders."
"I love this bike! The bike came almost completely assembled, so I just needed to put together the handlebars, pedals, and reflectors. The bike is light, and the seat is comfortable."
