Rear tire: 29×2.4.
Velopedia Bicycle Archive
2021 Rocky Mountain Fusion 40
Original specifications: 29" wheels · 29.48 LBS|13.4 KGS published weight · geometry for 4 published sizes.
Planning to sell? Draft your listing
At a glance
Archive #900004602- Model year
- 2021
- Category
- Mountain
- Original MSRP
- $1,249.00
- Sizes
- S, M, L, XL
- Colors
- Black/Beige
- Weight
- 29.48 LBS|13.4 KGS
- Geometry
- 4 manufacturer sizes
- In this record
- 21 specifications · archived image · original MSRP · geometry
Model history 1 other year
Browse other years
Compare side by side
Identification clues
2021 archived details
- Published colors
- Black/Beige
- Frame
- Aluminum
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildAluminum · 29"
Frameset
| Frame Construction | Rocky Mountain 6061 Alloy. Threaded BB. Zero Stack Tapered Headtube 0 Rear Triangle |
|---|---|
| Frame Material | Aluminum |
| Fork | RockShox Judy Silver Fast Black TK Air 100mm |
Drivetrain
| Shifters | Sram SX Eagle |
|---|---|
| Rear Derailleur | Sram SX Eagle |
| Crankset | Sram SX Eagle Powerspline 30T |
| Bottom Bracket | Sram Powerspline |
| Cassette | Sram PG-1210 11-50T |
| Chain | Sram SX Eagle |
Brakes
| Brakes | Shimano MT201 2 Piston |
|---|
Cockpit & Contact Points
| Headset | FSA No. 57B |
|---|---|
| Handlebar | Rocky Mountain XC 760mm |
| Stem | Rocky Mountain XC |
| Saddle | WTB Volt 142 |
| Seatpost | Rocky Mountain 30.9mm |
Wheels & Tires
| Hubs | Front: Shimano TX505; Rear: Shimano TX505 |
|---|---|
| Rims | WTB ST i30 TCS 2.0 Tubeless / Tubeless Compatible - Tape / Valves / Sealant Not Incl |
| Spokes | 2.0 Stainless |
| Front Tire | WTB Ranger Comp 29 x 2.4 |
| Rear Tire | WTB Ranger Comp 29 x 2.4 |
| Wheel Size | 29" |
No specifications match. Try a component name or clear your search.
Geometry
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
All geometry measurements4 sizes · 12 measurements
| Measurement | SM · 29″ | MD · 29″ | LG · 29″ | XL · 29″ |
|---|---|---|---|---|
| Seat tube | 380 mm | 420 mm | 445 mm | 480 mm |
| Effective top tube | 589 mm | 616 mm | 643 mm | 671 mm |
| Head tube | 95 mm | 100 mm | 110 mm | 120 mm |
| Head-tube angle | 66.5° | 66.5° | 66.5° | 66.5° |
| Seat-tube angle | 74.5° | 74.5° | 74.5° | 74.5° |
| Chainstay / rear center | 445 mm | 445 mm | 445 mm | 445 mm |
| Wheelbase | 1153 mm | 1180 mm | 1209 mm | 1238 mm |
| Bottom-bracket drop | 60 mm | 60 mm | 60 mm | 60 mm |
| Reach | 425 mm | 450 mm | 475 mm | 500 mm |
| Stack | 593 mm | 598 mm | 607 mm | 616 mm |
| Standover height | 763 mm | 776 mm | 786 mm | 801 mm |
| Wheel size | 29 | 29 | 29 | 29 |
Dimensions as recorded.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM = pedal turns per minute.
How it works
Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.
Speeds are estimates from tire size and pedal cadence. Actual speeds vary.
Try your current gearingChanged tires or gears? Calculate your setup.
Your changes apply to this calculation. The archived build stays unchanged.
Gearing results
| Measure | Original | Your setup |
|---|---|---|
| Lowest ratio | — | — |
| Highest ratio | — | — |
| Total range | — | — |
| Lowest-gear speed | — | — |
| Highest-gear speed | — | — |
Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.
Parts & serviceability
Find replacement parts

SRAM GX Eagle 12-Speed Chain Silver, 126 links
Replacement option

SRAM SX Eagle 12-Speed Rear Derailleur Black/Aluminum, One Size
Specification match
More parts (7)Fewer parts

Race Face Ride XC Seatpost Black, 30.9x375mm
Replacement option
Based on the original build. Check fit and installed parts before ordering. Affiliate links may earn Velopedia a commission. As an Amazon Associate I earn from qualifying purchases.
Service essentialsQuick reference before buying parts
Archived specifications for reference. Check the fitted parts before ordering.
- Seatpost diameter
- 30.9 mmCheck: Read the post’s diameter marking; seat-clamp size differs.
- Bottom bracket / shell
- Sram PowersplineCheck: Verify shell type and width, crank interface, and spindle length or spacers.
Not confirmed in this record: Front tire · Rear tire · Drivetrain. Check the fitted parts for these details.
Bike-specific inspection checklist 21 checks based on 6 archived component groups Open checklistClose checklist
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Identity and fit
Follow the full used-bike inspection order →Archived: 2021 Rocky Mountain Fusion 40 · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Rocky Mountain 6061 Alloy. Threaded BB. Zero Stack Tapered Headtube 0 Rear Triangle · Fork: RockShox Judy Silver Fast Black TK Air 100mm
Suspension
Evaluate the suspension →Archived: Fork: RockShox Judy Silver Fast Black TK Air 100mm
Drivetrain
Check drivetrain wear →Archived: Shifters: Sram SX Eagle · Rear derailleur: Sram SX Eagle · Crankset: Sram SX Eagle Powerspline 30T · Bottom bracket: Sram Powerspline · Cassette: Sram PG-1210 11-50T · Chain: Sram SX Eagle
Brakes
Inspect the brakes →Archived: Brakes: Shimano MT201 2 Piston
Wheels and tires
Check wheels and tires →Archived: Wheel size: 29" · Rims: WTB ST i30 TCS 2.0 Tubeless / Tubeless Compatible - Tape / Valves / Sealant Not Incl · Hubs: Front: Shimano TX505; Rear: Shimano TX505
Controls and contact points
Archived: Headset: FSA No. 57B · Handlebar: Rocky Mountain XC 760mm · Stem: Rocky Mountain XC · Seatpost: Rocky Mountain 30.9mm · Saddle: WTB Volt 142
Before and during the test ride
Follow the full used-bike inspection order →Have you owned this model?Help preserve its real-world history by sharing your owner experience.
Share the details that would help another rider understand how this model fits, rides and holds up over time. Velopedia reviews every contribution before publication.
Already contributed? Send me a fresh private edit link
For privacy, Velopedia shows the same confirmation whether or not an experience exists.
Checking current listings…
Find this bike on eBay
Search eBay US; check the model year, size and installed components. We may earn a commission from purchases.
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

