Name: Shimano XT M8100 Bike
Brand: AlliedCycleWorkscom-dev
Price: 6670.0 USD
Availability: InStock

XC Race

Shimano XT M8100 Bike

Build your BC40

XC Race

Build Your BC40

Shimano XT M8100 Bike

Saddle up and roll out with BC40’s go-to mechanical workhorse build with Shimano XT. Perfectly paired with ultra-reliable alloy wheels, it’s the ultimate no-fuss, all-fun XC MTB to rip singletrack, day in and day out.

Performance mechanical drivetrain
FOX 120mm front/rear travel
Industry Nine alloy wheels

RACE-DAY LIGHT, PLAY-DATE READY

Inspired by the rocky surfaces, dynamic corners, and punchy climbs of our legendary Back 40 trail, BC40 is a second-to-none, modern XC racing bike with legs to take on much bigger trails. Its lightweight, high-performance carbon frame and progressive geometry deliver fast accelerations and race-day sharpness. Its World Cup talent extends to the 120mm suspension travel that also sets it up as a do-it-all weekend trail sled, delivering uncanny levels of control and confidence beyond its category.

BC40 MODEL OVERVIEW

CHOSEN BY THE BEST

World Cup athlete and former World Champion Kate Courtney trusts BC40 to race to peak performances every time she takes to the start line. And no matter the build you chose on your BC40, you’ll experience the same high-performance frame ridden by the world’s best.

The specs below reflect the default Build Kit and do not account for customizations made in the Bike Builder. See your Build Summary above for custom choices.

Front derailleur	N/A
Rear derailleur	Shimano XT RD-M8100 12spd SGS
Shift levers	Shimano XT SL-M8100-1-R 12spd
Cassette	Shimano XT CS-M8100 12spd 10-51
Chain	Shimano XT CN-M8100 12spd
Crankset	Shimano XT FC-M8100-1
Bottom bracket	Shimano XT BB-MT8000 BSA
Brakes	Shimano XT BR-M8100 180mm/160mm
Handlebar	FSA SL-K MTB Carbon
Handlebar tape	ESI Chunky
Stem	FSA Gradient
Saddle	Selle Italia Novus Boost
Seatpost	Fox Transfer Performance 31.6
Wheelset	Industry Nine 1/1 Trail S Wheelset
Tires	MAXXIS Rekon 29x2.40 WT EXO/TR Tan Wall

Geometry

For optimal performance and control on fast and technical tracks, BC40 uses a slack head tube angle and a long front-to-center measurement. The result is geometry that positions the rider further behind the front wheel for world-class ride quality and predictable handling, no matter how hard you push it.

All units are in Millimeters or Degrees

	SM	MD	LG	XL
a Stack	598	609	622	633
b Reach	420	445	475	501
c Effective top tube	569	596	630	659
d Seat tube length	395	420	450	500
e Head tube length	95	105	120	135
f Head tube angle	66.5°	66.5°	66.5°	66.5°
g Seat tube angle	76°	76°	76°	76°
h Bottom bracket drop	40	40	40	40
i Chainstay length	435	435	435	435
k Wheelbase	1145	1174	1210	1241
m Fork rake	44	44	44	44
n Front center	710	739	778	806
o Wheel size	29	29	29	29

Size Guide

Please note, we do not have a height-based size chart. Since everyone's proportions are different, we prefer to have a human involved. Please email our fitting team at support@alliedcycleworks.com and we will custom fit you via your measurements and current bike geometry.

Small Reach: 420mm

157cm 5'2" - 167cm 5'7"

Medium Reach: 445mm

162cm 5'6" - 177cm 5'10"

Large Reach: 475mm

172cm 5'9" - 188cm 6'0"

X-Large Reach: 501mm

180cm 5'11" - 195cm 6'5"

Frequently Asked Questions

Quite simply, we love mountain biking. It’s in our DNA, and we are lucky enough to live/work in the mountain bike mecca of NWA. Just like the ECHO and ABLE, we built a bike that we wanted to ride, inspired by our local terrain and the demands our athletes require to perform at the highest level.

We try our best to accommodate custom options. Please reach out to us and we will let you know if it is possible and give you a quote.

Yes, all of our bikes and models ship set up tubeless with Orange Seal sealant.

No, since everyone's proportions are different, we prefer to have a human involved. Please email our fitting team at support@alliedcycleworks.com and we will custom fit you via your measurements and current bike geometry.

See exploded view HERE

The BC40 is set up with and designed around 120mm travel front and rear. It can also be set up with 110mm or 100mm options by utilizing different fork and shock options. You will see our athletes using the BC40 in 100mm travel mode for races like Leadville this summer.

The BC40 frame was designed, prototyped, and fully tested in-house at our factory in Bentonville, AR. The carbon layup and molding on the front and rear triangles take place at an external factory based in Asia. Each raw carbon part produced at the external factory undergoes a rigorous in-house quality inspection and paint preparation to ensure the highest standards. The suspension link, brake mount, and DUET stem are manufactured fully in-house at our Bentonville location. Finally, the frame is custom-painted and assembled to each customer’s unique order at our Bentonville facility, and goes through a final inspection and test ride before leaving the factory.

29x2.4” on all sizes.

We will offer options with SRAM, Shimano, Fox and RockShox so each rider can build their own dream bike.

Target frame weight including Sid Luxe Ultimate shock is 1950g/4.3lbs for size L; final weight will vary depending on size and paint option selected.

Like all ALLIED bikes, the BC40 is built to customer order. Each rider can choose from one of our many base and logo color options. Additionally, we hope to offer a couple of our athletes’ custom paint jobs as limited editions.

See attached for the BC40 Geo and Frame Specs.

All frame sizes have a 705mm (27.8") standover measured from the center of the bottom bracket to the top of the top tube.

Please reference our BC40 Saddle Height Guide for minimum and maximum saddle heights per dropper length.

Absolutely! Click here.

73mm English Threaded BSA

We spec it around the Chris King Dropset 3:

41mm 45x45 upper bearing
52mm 36x45 lower bearing

Two! One of any size on the downtube, and one 21oz or less on the seat tube. Double-check that your lid doesn't rub the shock mount and the base doesn't touch the downtube—you don't want it to rub your beautiful paint!

Support

BC40 Exploded Schematic 1 BC40 SPECS BC40 SADDLE HEIGHTS V2 BC40 GEO SPECS