
Shimano XT RD-M8100 Rear Derailleur Black, SGS, 12-Speed.
12-Speed.
Velopedia Bicycle Archive
Original specifications: 27.5" wheels · geometry for 4 published sizes.
Selling this bike? Create a shareable bike record
At a glance
| Frame Construction | Butted X6 Aluminum |
|---|---|
| Frame Material | Aluminum |
| Fork | Manitou Mastodon Pro EXT, 100mm, 15x150mm |
| Shifters | Shimano SLX SL-M7100-IR |
|---|---|
| Rear Derailleur | Shimano XT RD-M8100 |
| Crankset | Praxis Cadet M30, 30T, 170mm (S), 175mm (M, L, XL) |
| Bottom Bracket | Praxis M30, BSA Threaded |
| Cassette | Shimano SLX, 10/51, 12 Speed |
| Chain | Shimano Deore |
| Pedals | Nylon Flat |
| Brakes | (F) SRAM Level, Organic Pads / (R) SRAM Level, Organic Pads; Rotors: (F) Avid G2, 180mm / (R) Avid G2, 160mm; Levers: SRAM Level |
|---|
| Headset | Sealed Bearing, Tapered |
|---|---|
| Handlebar | Butted 6061 Alloy, 780mm, 20mm Rise |
| Stem | 6061 Alloy, 50mm Length, 35mm Clamp |
| Saddle | Fizik Alpaca Terra, Wingflex |
| Seatpost | X-Fusion Manic Dropper, 31.6mm, 125mm (S), 150mm (M), 170mm (L, XL) |
| Hubs | (F) Sealed Bearing, 15x150mm, 6 Bolt / (R) Bear Pawls, 12x197mm, Micro Spline, 6 Bolt |
|---|---|
| Rims | Sun Ringlé Mulefut SL, 27.5", 32H |
| Front Tire | Vee Snow Avalanche, TLR, 4.5", 120 TPI, Studdable |
| Rear Tire | Vee Snow Avalanche, TLR, 4.5", 120 TPI, Studdable |
| Wheel Size | 27.5" |
Frame measurements by size.
Published frame view
Select an available measurement to locate it on the frame.
| Measurement | S · 27.5" | M · 27.5" | L · 27.5" | XL · 27.5" |
|---|---|---|---|---|
| Seat tube | 400 mm | 425 mm | 450 mm | 500 mm |
| Effective top tube | 588 mm | 618 mm | 651 mm | 684 mm |
| Head tube | 100 mm | 100 mm | 110 mm | 120 mm |
| Head-tube angle | 68° | 68° | 68° | 68° |
| Seat-tube angle | 73° | 73° | 73° | 73° |
| Chainstay / rear center | 440 mm | 440 mm | 440 mm | 440 mm |
| Wheelbase | 1120 mm | 1150 mm | 1184 mm | 1217 mm |
| Bottom-bracket drop | 52 mm | 52 mm | 52 mm | 52 mm |
| Bottom-bracket height | 339 mm | 339 mm | 339 mm | 339 mm |
| Reach | 400 mm | 430 mm | 460 mm | 490 mm |
| Stack | 619 mm | 619 mm | 629 mm | 638 mm |
| Standover height | 682 mm | 682 mm | 696 mm | 724 mm |
| Fork offset / rake | 51 mm | 51 mm | 51 mm | 51 mm |
| Trail | 102 mm | 102 mm | 102 mm | 102 mm |
| Crank length | 170 mm | 175 mm | 175 mm | 175 mm |
| Stem length | 50 mm | 50 mm | 50 mm | 50 mm |
| Wheel size | 27.5" | 27.5" | 27.5" | 27.5" |
Measurements may vary by configuration, wheel size, or frame setting where noted in the published chart.
Parts & serviceability

12-Speed.

31.6mm, 125mm · Archived size S: 125 mm travel
Replacement option · verify fit
Based on the original build. Confirm the model, size and fit before ordering; installed parts may differ. As an Amazon Associate I earn from qualifying purchases. Velopedia may also earn from qualifying eBay purchases. Velopedia may also earn from qualifying retailer purchases.
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.
Archived: 2022 Norco Bigfoot S 1 · Mountain · Published sizes: S, M, L, XL
Archived: Frame: Butted X6 Aluminum · Fork: Manitou Mastodon Pro EXT, 100mm, 15x150mm
Archived: Fork: Manitou Mastodon Pro EXT, 100mm, 15x150mm
Archived: Shifters: Shimano SLX SL-M7100-IR · Rear derailleur: Shimano XT RD-M8100 · Crankset: Praxis Cadet M30, 30T, 170mm (S), 175mm (M, L, XL) · Bottom bracket: Praxis M30, BSA Threaded · Cassette: Shimano SLX, 10/51, 12 Speed · Chain: Shimano Deore
Archived: Brakes: (F) SRAM Level, Organic Pads / (R) SRAM Level, Organic Pads; Rotors: (F) Avid G2, 180mm / (R) Avid G2, 160mm; Levers: SRAM Level
Archived: Wheel size: 27.5" · Rims: Sun Ringlé Mulefut SL, 27.5", 32H · Hubs: (F) Sealed Bearing, 15x150mm, 6 Bolt / (R) Bear Pawls, 12x197mm, Micro Spline, 6 Bolt · Front tire: Vee Snow Avalanche, TLR, 4.5", 120 TPI, Studdable · Rear tire: Vee Snow Avalanche, TLR, 4.5", 120 TPI, Studdable
Archived: Headset: Sealed Bearing, Tapered · Handlebar: Butted 6061 Alloy, 780mm, 20mm Rise · Stem: 6061 Alloy, 50mm Length, 35mm Clamp · Seatpost: X-Fusion Manic Dropper, 31.6mm, 125mm (S), 150mm (M), 170mm (L, XL) · Saddle: Fizik Alpaca Terra, Wingflex · Pedals: Nylon Flat
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.
For privacy, Velopedia shows the same confirmation whether or not an experience exists.
Checking current listings…
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.