Built to help riders choose the right size
the right fit, and the right setup
Every serious build starts with the right measurements. Whether you are dialing in your cockpit, upgrading wheels, fitting new bodywork, or choosing riding gear that feels right on the road, size matters. The OFFRAMP Fitment & Size Guide gives Harley-Davidson riders and builders a practical reference for key dimensions, fitment details, and measurement points across parts and gear.
This guide will continue to expand as more OFFRAMP parts and selected partner products are released. Use it to check fitment before you order, plan your next upgrade with confidence, and build a machine that looks right, rides right, and feels like it was made for you.
Risers control handlebar height, rider reach, and cockpit feel. Before choosing risers for a Harley-Davidson build, check the rise height, clamp diameter, mounting bolt size, mounting spacing, pullback, and cable clearance.
| Common Size | English Reference | |
|---|---|---|
| 2″ / 50.8 mm | Low-rise setup for mild handlebar height adjustment. | |
| 4″ / 101.6 mm | Common low-to-mid riser height for cruiser and light custom builds. | |
| 6″ / 152.4 mm | Popular entry height for Club Style and performance Harley builds. | |
| 8″ / 203.2 mm | One of the most common performance-style riser heights. | |
| 10″ / 254 mm | Tall riser setup for a more upright and aggressive cockpit. | |
| 12″ / 304.8 mm | Common tall T-Bar or Club Style riser height. | |
| 14″ / 355.6 mm | Extra-tall setup for bold custom builds and specific rider preference. | |
| 1″ Clamp / 25.4 mm | Common Harley handlebar clamp diameter. | |
| 1-1/8″ Clamp / 28.6 mm | Often used on oversized or performance-style handlebars. | |
| 1-1/4″ Clamp / 31.8 mm | Common for thicker handlebars, bagger bars, and heavy custom setups. | |
| 1/2″-13 Mounting Bolt | Common mounting thread size for many Harley-style aftermarket risers. | |
| 3.5″ On-Center Spacing | Common center-to-center spacing for dual-riser Harley setups. |
Handlebar size affects riding posture, control feel, cable length, internal wiring, and the overall style of the build. Key measurements include width, rise, pullback, clamp diameter, grip area diameter, and bar-end dimensions.
| Common Size | Reference | |
|---|---|---|
| 1″ / 25.4 mm Grip Area | Standard grip and control area size for many Harley-style handlebars. | |
| 1″ / 25.4 mm Clamp Area | Traditional clamp diameter for many OEM-style and aftermarket bars. | |
| 1-1/4″ / 31.8 mm Handlebar | Common oversized bar diameter for bagger, touring, and ape hanger setups. | |
| 1-1/2″ / 38.1 mm Handlebar | Extra-thick custom bar diameter for a heavier visual profile. | |
| 8″–10″ Rise | Mid-to-tall rise range for comfort cruising and light Club Style builds. | |
| 12″–14″ Rise | Common height range for ape hangers, chopper bars, and tall Club Style setups. | |
| 28″–32″ Overall Width | Common width range for narrower bars, ape hangers, and vintage-style setups. | |
| 32″–36″ Overall Width | Common width range for moto bars, tracker bars, and performance-style builds. | |
| 2″–6″ Pullback | Typical pullback range that affects rider reach and upper-body position. |
Windshields and fairings affect wind protection, rider comfort, helmet buffeting, visibility, and the overall front-end style of a Harley-Davidson build. Key measurements include windshield height, windshield width, fairing width, headlight opening, mounting hole spacing, bracket position, fork clearance, handlebar clearance, and rider eye-line height.
| Common Size | Reference | |
|---|---|---|
| 4″–6″ Windshield | Short sport-style windshield for a lower profile and stronger custom look. | |
| 8″ Windshield | Compact windshield height often used for sport touring and performance-style fairings. | |
| 10″ Windshield | Common mid-height windshield for a balance between airflow control and visibility. | |
| 12″ Windshield | Touring-friendly windshield height for more wind protection on longer rides. | |
| 13.5″ Windshield | Taller pro-touring style height for riders who want more upper-body wind coverage. | |
| 15″ Windshield | Tall windshield option for maximum wind protection and long-distance comfort. | |
| 19″–22″ Width | Common width range for many Batwing-style replacement windshields. | |
| 26″+ Width | Common wide reference for Road Glide-style fixed fairing windshields. | |
| 33″–34″ Fairing Width | Typical outer width reference for some aftermarket Batwing-style fairings. | |
| 17″ Fairing Body Height | Common body-height reference for certain aftermarket Batwing fairings, not including windshield. | |
| 5.75″ Headlight Opening | Common smaller round headlight size used on many Harley custom and narrow-front-end builds. | |
| 7″ Headlight Opening | Common larger round headlight size used on touring, bagger, and larger fairing setups. | |
| Center-to-Center Mounting Holes | Windshield and fairing mounting holes should be measured from center to center, not edge to edge. | |
| Fork-Mounted Fairing | Fairing mounts to the front fork area; check fork tube size, bracket spacing, and handlebar clearance. | |
| Frame-Mounted Fairing | Fairing mounts to the frame or fixed front structure; check model-specific brackets and headlight alignment. | |
| Quick-Detach Mounting Kit | Detachable fairing or windshield setup that requires matching plates, brackets, and hardware. |
Wheel size is normally shown as diameter × rim width. For Harley-Davidson wheel fitment, confirm front or rear position, rim width, axle size, bearing size, brake rotor pattern, pulley pattern, ABS compatibility, and tire clearance.
| Common Size | Reference | |
|---|---|---|
| 16″ × 3.0″ | Traditional Harley wheel size used on many classic-style setups. | |
| 16″ × 5.0″ | Common rear wheel size for many touring and bagger-style applications. | |
| 17″ × 3.0″ | Common front wheel size on selected Harley touring applications. | |
| 18″ × 3.0″ | Common front wheel reference for Street Glide, Road Glide, and performance-style setups. | |
| 18″ × 4.25″ | Common rear wheel size for custom and performance builds. | |
| 18″ × 5.5″ | Wider rear wheel setup often used for custom performance or wide-tire builds. | |
| 19″ × 2.15″ | Narrow 19-inch front wheel size often seen on classic or standard setups. | |
| 19″ × 3.0″ | Wider 19-inch front wheel size used on touring and performance builds. | |
| 21″ × 2.15″ | Narrow 21-inch front wheel for chopper, Softail, and classic custom styles. | |
| 21″ × 3.5″ | Popular 21-inch front wheel size for bagger, touring, and performance builds. | |
| 23″ Front Wheel | Large front wheel custom setup requiring clearance and fitment checks. | |
| 26″ Front Wheel | Extreme custom bagger size, usually requiring major front-end modifications. |
Brake rotor size affects braking performance, caliper compatibility, wheel fitment, and front-end setup. Before ordering rotors, confirm diameter, bolt pattern, center bore, rotor thickness, left/right position, and ABS compatibility.
| Common Size | Reference | |
|---|---|---|
| 11.5″ / 292 mm | Common Harley-style rotor diameter for many OEM-style and aftermarket applications. | |
| 11.8″ / 300 mm | Common rotor size on newer Harley applications and aftermarket upgrades. | |
| 13″ / 330 mm | Oversized rotor option for performance bagger and braking upgrades. | |
| 5-Bolt Rotor Pattern | Common Harley brake rotor mounting style; exact bolt circle must be confirmed. | |
| Front Rotor | Front brake rotor; confirm single-disc or dual-disc configuration. | |
| Rear Rotor | Rear brake rotor; confirm hub, caliper, and pulley clearance. | |
| Floating Rotor | Performance-oriented rotor design with better heat and movement control. | |
| Fixed Rotor | Standard rotor design often used for OEM-style replacement. |
Motorcycle tire size must match wheel diameter, rim width, load rating, speed rating, and riding purpose. Harley tires may use metric sizing, alpha sizing, bias-ply, belted, or radial construction depending on the model and year.
| Common Size | Reference | |
|---|---|---|
| 100/90-19 | Common 19-inch front tire size on selected Sportster and classic-style models. | |
| 120/70R19 | Common 19-inch radial front tire size for touring and performance setups. | |
| 80/90-21 | Narrow 21-inch front tire commonly used on chopper and Softail-style builds. | |
| MH90-21 | Harley-style alpha-size reference for many 21-inch front tire applications. | |
| 130/90-16 | Traditional Harley tire size used on many front or rear applications. | |
| 150/80-16 | Common cruiser, Softail, and touring rear tire reference size. | |
| 180/65-16 | Common rear tire size for many touring and bagger-style applications. | |
| 180/60-17 | Common 17-inch rear tire size for performance-oriented builds. | |
| 200/55R17 | Wide rear radial tire often used on performance or wide-tire setups. | |
| 120/70ZR18 | Common 18-inch performance tire size for front or sport-oriented setups. |
Grip and throttle tube fitment depends on handlebar diameter and throttle type. Most Harley-style grips are built around 1-inch handlebars, but cable throttle and throttle-by-wire systems require different throttle tube designs.
| Common Size | Reference | |
|---|---|---|
| 1″ / 25.4 mm Handlebar | Standard Harley-style grip and throttle tube fitment size. | |
| 7/8″ / 22.2 mm Handlebar | More common on metric bikes, dirt bikes, and some special custom applications. | |
| Cable Throttle | Mechanical throttle setup using one or two throttle cables. | |
| Throttle By Wire / TBW | Electronic throttle system used on many newer Harley models. | |
| Single Cable Throttle Tube | Throttle tube designed for single-cable throttle operation. | |
| Dual Cable Throttle Tube | Throttle tube designed for push-pull dual-cable throttle systems. | |
| Open-End Grips | Grip design that allows bar-end mirrors, plugs, or internal throttle components. | |
| Closed-End Grips | Grip design with a finished outer end for a cleaner closed look. |
Axle and bearing sizes are critical for wheel fitment. When changing wheels, confirm axle diameter, bearing inner diameter, hub width, spacer setup, ABS bearing type, and front or rear position.
| Common Size | Reference | |
|---|---|---|
| 3/4″ Axle | Common axle size on many earlier Harley-Davidson models. | |
| 1″ Axle | Common axle size used on selected Harley-Davidson model years. | |
| 25 mm Axle | Common axle size on many later Harley-Davidson applications. | |
| 3/4″ Bearing I.D. | Wheel bearing inner diameter designed for a 3/4-inch axle. | |
| 1″ Bearing I.D. | Wheel bearing inner diameter designed for a 1-inch axle. | |
| 25 mm Bearing I.D. | Wheel bearing inner diameter designed for a 25 mm axle. | |
| ABS Bearing | Bearing with ABS signal function for ABS-equipped motorcycles. | |
| Non-ABS Bearing | Standard wheel bearing for non-ABS motorcycles. | |
| Wheel Spacers | Spacers used to center the wheel and set correct side clearance. |
Please note that all measurements listed here are general industry references. Actual fitment may vary by model year, trim, market, front-end setup, wheel configuration, brake system, handlebar setup, fairing style, and previous modifications. Before ordering or installation, always confirm your motorcycle’s exact specifications and check the product page for detailed fitment information.
When in doubt, measure twice, wrench once — and build it right.
This guide will continue to grow as more OFFRAMP parts and selected partner products are released.
