2023 Boardman MTR 8.6 vs 2025 YT Jeffsy CORE
The M is the YT Jeffsy CORE size closest to your M Boardman MTR 8.6. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the YT Jeffsy CORE
Compared with the Boardman MTR 8.6 in M, the YT Jeffsy CORE in M places the top of the head tube 10 mm higher and 5 mm further back, relative to the bottom bracket.
- Frame stack
- +10 mm
- Higher front end
- Frame reach
- −5 mm
- Shorter frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- −0.5°
- Slacker: calmer steering
- Chainstays
- −3 mm
- Shorter: livelier
The two frames
We can't draw these frames yet. The Boardman MTR 8.6 numbers we have for size M are missing the wheelbase. The numbers below still compare.
Geometry side by side
| Measurement | Boardman MTR 8.6 M | YT Jeffsy CORE M | Difference |
|---|---|---|---|
| Reach | 460 | 455 | −5 mm |
| Stack | 610 | 620 | +10 mm |
| Head tube angle | 65.5 | 65 | −0.5° |
| Seat tube angle | 77.5 | 77.2 | −0.3° |
| Effective top tube | 595 | not listed | |
| Chainstay length | 440 | 437 | −3 mm |
| Seat tube length | 430 | not listed | |
| Head tube length | 110 | not listed | |
| Wheelbase | not listed | 1214 | |
| BB drop | not listed | 33 |
Differences are the YT Jeffsy CORE minus the Boardman MTR 8.6. Full charts: 2023 Boardman MTR 8.6, 2025 YT Jeffsy CORE.
Where each sits in its class
Boardman MTR 8.6YT Jeffsy CORE
Each bike is ranked against the other trail bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | Boardman MTR 8.6MTR 8.6 | YT Jeffsy CORECORE 1 |
|---|---|---|
| Frame | Boardman 6061 Butted Alloy | not listed |
| Fork | SR Suntour XCR 34 | Marzocchi Bomber Z1 |
| Rear shock | RockShox Deluxe Select | Marzocchi Bomber Air |
| Shifter | microSHIFT Advent | Shimano Deore |
| Derailleur | microSHIFT Advent | Shimano Deore |
| Cassette | microSHIFT CS-H104 | Shimano Deore M6100 |
| Chain | KMC X10 | not listed |
| Crankset | Prowheel Charm | Shimano Deore M512 |
| Chainring | Prowheel Charm | not listed |
| Pedals | Wellgo Flats | not listed |
| Wheelset | Boardman Alloy | Sun Ringlé SR329 Trail Comp |
| Tire | Maxxis Forekaster, Maxxis Rekon | Maxxis Minion DHF, Maxxis Minion DHR II DD |
| Brake | Tektro HD-280 | SRAM DB8 Stealth |
| Rotor | Tektro HD-280 | not listed |
| Handlebar | Boardman 6061 Alloy | YT Handlebar 35 |
| Stem | Boardman Alloy | YT Stem 35 |
| Grips | Boardman lock-on | ODI Elite Motion V2.1 |
| Headset | FSA No.42 | Cane Creek Series 10 |
| Seatpost | Boardman Alloy | YT Seatpost |
| Saddle | Boardman MTB | YT Custom Design |
| Bottom bracket | not listed | Shimano MT501 |
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