Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Radio
2021 Radio Siren
Previous used estimate
$1,505 - $1,548
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 Radio Siren
12-month projected trend
12%
Direction and magnitude, not judgment
vs. category average
3%
Drops faster than category avg
Price over time - 2021 Radio Siren
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
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Overview
About this bike
When it came to starting work on our very first full-suspension slopestyle rig, we wanted to take our time to ensure that this thing rode just as dialed as it looked. The Siren frame is crafted from premium grade 6061-T6 hydroformed alloy and features a short chainstay length and responsive geometry, allowing you to really throw this thing about as if it was a hardtail. The Siren uses RockShox suspension front and rear for a smooth ride that gives you enough cushion on heavy impacts without sacrificing speed or feel. Backed up with the finest components from Race Face, SRAM, and Maxxis, the Siren is the perfect "do it all" weapon for sending it at the bike park, cruising through the trails, or pushing for the podium at diamond slopestyle events.
Specifications
- Subtype
- Cross Country
- Category
- Mountain
- Component Fork
- RockShox Pike DJ fork, 100mm travel
- Component Hubs
- Front: Radio PRO-DJ disc hub, sealed, 15mm alloy through axle, 32h Rear: Radio PRO-DJ disc hub, sealed, 3/8" crmo axle, 32h
- Component Size
- 22.8-inch
- Component Stem
- Race Face Chester 35 front load stem, alloy, 40mm reach
- Product Family
- Siren
- Component Chain
- SALT AM chain, WZ1 type
- Component Color
- Matt Black
- Component Frame
- Radio Siren frame, 6061-T6 hydroformed & butted alloy, tapered head tube, 100mm travel
- Component Brakes
- Front: Tektro Aries mechanical disc brake, 160mm rotor Rear: SRAM DB-LVL-A1 hydraulic disc brake, 160mm rotor
- Component Pedals
- Radio SLIM nylon/fiberglass
- Component Saddle
- Radio Century Pivotal seat fat padded
- Component Headset
- FSA NO.42/ACB-A integrated a-headset, 1-1/8"-1.5"
- Component Crankset
- Race Face Aeffect crank alloy, 170mm
- Component Seatpost
- Radio 27.2mm alloy Pivotal
- Component Handlebar
- Radio Griffin bar, 6061-T6 alloy, 35mm
- Component Rear Tire
- Maxxis DTH tires, 2.3"
- Component Chainrings
- Race Face Aeffect alloy sprocket 28T
- Component Front Tire
- Maxxis DTH tires, 2.3"
- Component Rear Shock
- RockShox RS-Monarch R 190x51
- Component Tape Grips
- Radio Frequency XL grips, flangeless, 160mm
- Component Brake Levers
- Tektro RS-360A front, SRAM DB-LVL-A1 rear
- Component Bottom Bracket
- Race Face Aeffect BSA, sealed bearing
- Component Cassette Freewheel
- 10T cassette driver, sealed bearing
- Rear Shock
- RockShox RS-Monarch R 190x51
- Hubs
- Front: Radio PRO-DJ disc hub, sealed, 15mm alloy through axle, 32h Rear: Radio PRO-DJ disc hub, sealed, 3/8" crmo axle, 32h
- Crankset
- Race Face Aeffect crank alloy, 170mm
- Pedals
- Radio SLIM nylon/fiberglass
- Bottom Bracket
- Race Face Aeffect BSA, sealed bearing
- Chain
- SALT AM chain, WZ1 type
- Seatpost
- Radio 27.2mm alloy Pivotal
- Saddle
- Radio Century Pivotal seat fat padded
- Handlebar
- Radio Griffin bar, 6061-T6 alloy, 35mm
- Headset
- FSA NO.42/ACB-A integrated a-headset, 1-1/8"-1.5"
- Rear Tire
- Maxxis DTH tires, 2.3"
- Stem
- Race Face Chester 35 front load stem, alloy, 40mm reach
- Brake Levers
- Tektro RS-360A front, SRAM DB-LVL-A1 rear
- Brakes
- Front: Tektro Aries mechanical disc brake, 160mm rotor Rear: SRAM DB-LVL-A1 hydraulic disc brake, 160mm rotor
- Chainrings
- Race Face Aeffect alloy sprocket 28T
- Fork
- RockShox Pike DJ fork, 100mm travel
- Frame
- Radio Siren frame, 6061-T6 hydroformed & butted alloy, tapered head tube, 100mm travel
- Tape/Grips
- Radio Frequency XL grips, flangeless, 160mm
- Color
- Matt Black
- Size
- 22.8-inch
- Cassette/Freewheel
- 10T cassette driver, sealed bearing
- Front Tire
- Maxxis DTH tires, 2.3"
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Suspension service
Confirm fork and rear shock service intervals and check pivot bearings for play.