Rear tire: 27.5×2.35.
Velopedia Bicycle Archive
2021 Kona Blast
Original specifications: 27.5" wheels · geometry for 4 published sizes.
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At a glance
Archive #900001982- Model year
- 2021
- Category
- Mountain
- Original MSRP
- $1,049.00
- Sizes
- S, M, L, XL
- Colors
- Gloss Chocolate w/ Yellow, Rust & Flame Fade Decals
- Geometry
- 4 manufacturer sizes
- In this record
- 22 specifications · archived image · original MSRP · geometry
Model history 19 other years
Browse other years
Compare side by side
Identification clues
2021 archived details
- Published colors
- Gloss Chocolate w/ Yellow, Rust & Flame Fade Decals
- Frame
- Aluminum
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildAluminum · 27.5"
Frameset
| Frame Construction | Kona Race Light 6061 Aluminum Butted |
|---|---|
| Frame Material | Aluminum |
| Fork | RockShox Judy Silver TK Solo Air 100mm |
Drivetrain
| Shifters | Shimano Deore |
|---|---|
| Rear Derailleur | Shimano Deore |
| Crankset | FSA Alpha Drive 1x; Chainring: 28t |
| Bottom Bracket | FSA 7420 73mm |
| Cassette | Shimano Deore 11-51t 11spd |
| Chain | KMC X11 |
| Pedals | Kona JS2 |
Brakes
| Brakes | Brake Calipers: Shimano MT201 Hydraulic; Front Brake Rotor: Shimano RT10 180mm (centerlock); Rear Brake Rotor: Shimano RT10 160mm (centerlock); Brake Levers: Shimano MT201 Hydraulic |
|---|
Cockpit & Contact Points
| Headset | FSA No.57B |
|---|---|
| Handlebar | Kona XC/BC Riser |
| Stem | Kona XC |
| Saddle | Kona XC |
| Seatpost | Kona Thumb 31.6mm |
Wheels & Tires
| Hubs | (F) Formula 100x9mm (centerlock) / (R) Shimano 135x10mm (centerlock) |
|---|---|
| Rims | WTB ST I27 TCS 2.0 |
| Spokes | Stainless Black 14g |
| Front Tire | Maxxis Forekaster 27.5x2.35" |
| Rear Tire | Maxxis Forekaster 27.5x2.35" |
| Wheel Size | 27.5" |
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 · 15 measurements
| Measurement | S | M | L | XL |
|---|---|---|---|---|
| Seat tube | 370 mm | 420 mm | 470 mm | 530 mm |
| Top tube | 572 mm | 600 mm | 628 mm | 667 mm |
| Head tube | 100 mm | 115 mm | 125 mm | 140 mm |
| Head-tube angle | 68° | 68° | 68° | 68° |
| Seat-tube angle | 75° | 75° | 75° | 75° |
| Chainstay / rear center | 435 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1109 mm | 1139 mm | 1168 mm | 1208 mm |
| Bottom-bracket drop | 50 mm | 50 mm | 50 mm | 50 mm |
| Bottom-bracket height | 305 mm | 305 mm | 305 mm | 305 mm |
| Reach | 415 mm | 440 mm | 465 mm | 500 mm |
| Stack | 585 mm | 599 mm | 608 mm | 622 mm |
| Standover height | 710 mm | 719 mm | 725 mm | 748 mm |
| Fork offset / rake | 42 mm | 42 mm | 42 mm | 42 mm |
| Front center | 678 mm | 709 mm | 737 mm | 778 mm |
| Fork length / axle-to-crown | 490 mm | 490 mm | 490 mm | 490 mm |
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

Shimano CS-M5100 Cassette 11 Speed, 11-51T
Specification match

FSA Energy SB20 Seatpost Grey, 31.6mm x 350mm
Replacement option
More parts (6)Fewer parts
Chainring: 28t
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.
- Front tire
- Maxxis Forekaster 27.5x2.35"Check: Verify the fitted tire’s size marking and rim type.
- Rear tire
- Maxxis Forekaster 27.5x2.35"Check: Verify the rear size; it may differ from the front.
- Drivetrain
- 11-speedCheck: Match the installed drivetrain family, not just its speed count.
- Seatpost diameter
- 31.6 mmCheck: Read the post’s diameter marking; seat-clamp size differs.
- Bottom bracket / shell
- FSA 7420 73mmCheck: Verify shell type and width, crank interface, and spindle length or spacers.
Bike-specific inspection checklist 20 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 Kona Blast · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Kona Race Light 6061 Aluminum Butted · Fork: RockShox Judy Silver TK Solo Air 100mm
Suspension
Evaluate the suspension →Archived: Fork: RockShox Judy Silver TK Solo Air 100mm
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano Deore · Rear derailleur: Shimano Deore · Crankset: FSA Alpha Drive 1x; Chainring: 28t · Bottom bracket: FSA 7420 73mm · Cassette: Shimano Deore 11-51t 11spd · Chain: KMC X11
Brakes
Inspect the brakes →Archived: Brakes: Brake Calipers: Shimano MT201 Hydraulic; Front Brake Rotor: Shimano RT10 180mm (centerlock); Rear Brake Rotor: Shimano RT10 160mm (centerlock); Brake Levers: Shimano MT201 Hydraulic
Wheels and tires
Check wheels and tires →Archived: Wheel size: 27.5" · Rims: WTB ST i27 TCS 2.0 · Hubs: (F) Formula 100x9mm (centerlock) / (R) Shimano 135x10mm (centerlock) · Front tire: Maxxis Forekaster 27.5x2.35" · Rear tire: Maxxis Forekaster 27.5x2.35"
Controls and contact points
Archived: Headset: FSA No.57B · Handlebar: Kona XC/BC Riser · Stem: Kona XC · Seatpost: Kona Thumb 31.6mm · Saddle: Kona XC · Pedals: Kona JS2
Before and during the test ride
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.





