Name: Harper Coaster Bike - Single Speed
Brand: Retrospec
Price: 199.99 USD
Availability: InStock
Rating: 4.7 (985 reviews)

Features

Durable Steel Frame

High-tensile strength steel is tough, resistant to fatigue, and shock-absorbing－a must for city riding.

Single Speed

Single speed bikes boast fewer components than multi-gear bikes, which keeps them lighter, less complicated, and easier to maintain.

Commuter Tires

Grooved tires grip the pavement and dispel water for solid traction, rain or shine.

Coaster Brake

To stop and take in the views, simply pedal backwards.

Durable Steel Frame

High-tensile strength steel is tough, resistant to fatigue, and shock-absorbing－a must for city riding.
Single Speed

Single speed bikes boast fewer components than multi-gear bikes, which keeps them lighter, less complicated, and easier to maintain.
Commuter Tires

Grooved tires grip the pavement and dispel water for solid traction, rain or shine.
Coaster Brake

To stop and take in the views, simply pedal backwards.

All Natural Fun From the Field

Best for pavement

Pavement

Gravel

All terrain

Best for flat

Flat

Some hills

Hilly

Mountain

"Retrospec makes some of the best affordable recreational bikes."

⚠️ WARNING! This product can expose you to chemicals including Carbon-Black Extracts, which is known to the state of California to cause cancer and birth defects or other reproductive harm. For more information go to https://www.p65warnings.ca.gov/

We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, materials, and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice. Bike and frame weights are based off pre-production painted frames at time of publication. Weights may vary in final production.

Specifications
Sizing
Financing
Assembly & Owner's Manual

Specifications

Frameset

Frame Hand Built tig-welded high-tensile steel, "UrbanComfort" design
Fork Unicrown, Threaded, 28.6mm, 1x fender-eyelet

Wheelset

Rims Retrospec aluminum double-wall 32H, 30mm V-section, precision machined brake tracks
Spokes 14G UCP
Tires Retrospec 700 x 28C all-season, P/V valves

Recommended Weight Limit 250 LBS

Drivetrain

Chain KMC 1/8”
Bottom Bracket 68x110 Cartridge Sealed

Components

Headset 1 1/8" (28.6mm) steel, Threaded
Brakes Rear Coaster Brake
Handlebars Aluminum Alloy 520mm Wide x 30mm Rise, 25.4
Grips Retrospec Triangle Kraton 125mm length
Stem Quill-type aluminum 80mm extension, -17⁰ rise, 25.4 handlebar clamp, 22.2 quill
Saddle Retrospec Pista
Seatpost Aluminum Alloy Seat Post 25.4 x 300mm with Micro Adjust head
Seatpost Clamp Aluminum alloy CNC precision 28.6mm
Pedals Low-Profile Platform, Reinforced Nylon resin, 9/16"

Sizing

How to measure my inseam for a bike

Your inseam can help you find the perfect sized bike (measuring it properly is similar to pant inseams but measured a little differently). Here's how they work:

Stand upright with your feet 6-8" apart.
Using a tape measure or tailor tape, measure from the bottom of your foot to the top of the inside of your leg.
Compare your inseam measurement to the standover height of the bike. You should have about an inch of space between your body and the top tube.

ARider Height

BInseam

CTop Tube

Size	Height Range	Standover Height
43CM - XS	5’5” - 5’7”	29.5"
49CM - S	5’8” - 5’10”	31"
53CM - M	5’11” - 6’0"	32.25"
57CM - L	6’1” - 6’2”	33.375"
60CM - XL	6’3” - 6’5"	35"

Financing

Buy Now, Pay Later

Make easy monthly payments over 3,6 or 12 months

$68.36

PER MONTH

3 MONTHS

APR 15.15%

Interest $5.09

Total $205.08

$34.83

PER MONTH

6 MONTHS

APR 15.25%

Interest $8.99

Total $208.98

$18.07

PER MONTH

12 MONTHS

APR 15.24%

Interest $16.85

Total $216.84

Get a real-time decision with just 5 pieces of info.

Assembly & Owner's Manual

Assembly Instructions

Owner's Manual

4.7

Rated 4.7 out of 5 stars

Based on 985 reviews

Total 5 star reviews: 774 Total 4 star reviews: 168 Total 3 star reviews: 42 Total 2 star reviews: 1 Total 1 star reviews: 0

985 reviews

Sort

Michael J.
Verified Buyer
4/21/25
Rated 5 out of 5 stars
Love it
Even retrospec will tell you this isn’t a high end road bike, but this was the exact bike I needed for this time in my life: something simple to ride and maintain that will get me around town. I was very pleased with the instructions, assembly, and build quality. I’d absolutely recommend.
Was this helpful?
Andrei K.
Verified Buyer
4/21/25
Rated 5 out of 5 stars
Great simple bike
Absolutely love it! Simple, lightweight, and fun to ride.
Was this helpful?
james b.
Verified Buyer
4/8/25
Rated 5 out of 5 stars
Good for around town
Got it to stay in shape after getting back from a county where I walked and biked a lot. Great fit. Very easy to assemble
Was this helpful?
Kenneth S.
Verified Buyer
4/8/25
Rated 4 out of 5 stars
Harper bike
Sharp looking bike and easy to assemble. Just wish it came with a kick stand
Was this helpful?
Darrell C.
Verified Reviewer
4/5/25
Rated 5 out of 5 stars
Harper kills it! Loved mine rode it 25 Miles a day for over a year until the local punks clipped me for it.I m sold on this bike I've had more $$ bikes but for how I ride this is the best deal on 2 wheels
Gotta get another one soon
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