2025 DIY Carbon Bikes JK27 Base
- Category
- Hardtail Cross-country MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Carbon/Composite
- Suspension
- 110mm fork travel, 20% sag
- Features
- Disc brake
Geometry
XS | S | |
Stack | 574mm | 574mm |
Reach | 381mm | 396mm |
Stack to Reach Ratio | 1.51:1 | 1.45:1 |
Seat Tube Length, C-T | 343mm | 381mm |
Top Tube Length, Effective/Horizontal Unknown | 540mm | 555mm |
Top Tube Slope | 30deg | 25deg |
Head Tube Angle | 69.5deg | 69.5deg |
Seat Tube Angle | 74.5deg | 74.5deg |
Head Tube Length | 90mm | 90mm |
Bottom Bracket Drop | 45mm | 45mm |
Bottom Bracket Height | 300.3mm | 300.3mm |
Chainstay Length | 425mm | 425mm |
Chainstay Length Horizontal | 422.6mm | 422.6mm |
Front-Center | 628mm | 628mm |
Front-Center Horizontal | 626.4mm | 626.4mm |
Wheelbase | 1049mm | 1049mm |
Fork Offset/Rake | 45mm | 45mm |
Trail | 81.1mm very high | 81.1mm very high |
Mechanical Trail | 75.9mm | 75.9mm |
Wheel Flop | 26.6mm | 26.6mm |
Tire to Pedal Spindle | 112.7mm 170 mm cranks | 112.7mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 130.3mm 170 mm cranks | 130.3mm 170 mm cranks |
Base Build
XS | S | |
Wheel Size | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD |
Tire Width | 2.1in | 2.1in |
Tire Width Max | 2.35in | 2.35in |
Tire Outer Diameter | 690.7mm | 690.7mm |
Bike Length with Tires | 1739.7mm | 1739.7mm |
Published Sizing Recommendations
Height | 4 ft 10 in to 5 ft 2 in | 5 ft 3 in to 5 ft 6 in |
Stack and Reach vs. Category Trend
Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive
The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.
Learn more about the Upright/Aggressive ScaleCategory Trend
Hardtail Cross-country MTBSource:https://www.diycarbonbikes.com/collections/junior-kids-frames/products/dcb-jk27-junior-kids-trailcraft-timber-27-5-style-mountain-bike-frame