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Motobecane Immortal Disc Pro SL Carbon Fiber Gravel Bike Review

By Rob Robinette


Spoiler: I love this bike.

I'm a 61 year old retired military and airline pilot who had gotten about 40 pounds overweight. But in August 2019, while visiting friends in Hungary, I did a lot of ebike riding which ended up being a kickstart to cycling for fitness. When I got home to hilly East Tennessee I began riding my 1995 Cannondale Super V 900 mountain bike while I did research on ebikes. I purchased an Aventon.com Pace 500 ebike online and was blown away by the value and riding fun. I have almost 900 miles on the Pace since September 3rd.

Aventon Pace 500 ebike


Fast forward to mid November and I'm over 25 pounds lighter and much more fit. I enjoyed riding so much I decided it was time for my first "road bike". I actually went with a "gravel bike" for the wider, more comfortable tires but I wanted to stick with 700c tires since the bike would be used almost exclusively for the road.

I ordered a Salsa Journeyman 700c Drop Bar from my local bike shop but found out it would be late January at the earliest for delivery so I canceled the order and started looking again. I had seen bikesdirect.com before and decided to check out what they had to offer.

I liked what I saw in the $2100 Motobecane Immortal Disc Pro SL (Super Light) 57cm gravel bike with Taiwanese unidirectional weave carbon fiber frame (natural carbon color) with through-axles, carbon aero fork, full Shimano Ultegra R8000 drivetrain, Ultegra hydraulic disc brakes and DT Swiss wheelset with Schwalbe G-One Allround 35mm (1.4") tires. Motobecane lists the max tire width at 41mm (1.6") but owners have reported 45mm (1.8") fit just fine. The bike is similar to the Salsa Carbon Warbird other than the Warbird's Di2 electric shift upgrade.

Motobecane Immortal Disc Pro SL

I went with carbon fiber gray but the red looks pretty good too. The carbon fiber frame has cable tubes installed for internal routing and easy cable swap out. Photos from BikesDirect.com website.

I ordered the bike on Tuesday and it was delivered on Saturday by FedEx. The bike arrived without a single scratch. I took my time assembling it in about an hour. Assembly requires installing the seatpost (seat already attached), front brake disc, front wheel, handlebar and pedals. The steering stem had one spacer above it so I removed the stem and placed the spacer below the stem to get it as high as possible. I also turned the stem upside down to go from -6 to +6, again to raise the bars for more comfort. I replaced the aluminum seatpost with a carbon fiber post and installed Shimano SPD pedals and a carbon fiber bottle cage. The bike looks like a freakin' sex machine.



Since this is my first road bike I'm obviously not an expert reviewer but I do love the bike. I cannot believe how light it is. The weight plus low rolling resistance allows me to climb hills at speed I never dreamed of. I was afraid the lowest 1:1 (34t/34t) gearing might be too high for some of the very steep Tennessee hills but it turned out to be perfect.

Gear Ratios

The gear ratios tell us how many revolutions the rear tire will turn for every pedal crank revolution. The lowest is 1.00, meaning when we turn one turn of the crank the rear wheel turns one turn. The highest gearing is 4.55 for 4.55 turns of the rear wheel for every turn of the crank. Cassette gears are: 11-speed, 11-13-15-17-19-21-23-25-27-30-34t.

The two Shimano chainrings have 50 and 34 teeth and the cassette is an 11 speed 11-34t with minimum gearing of 1:1 (27.2 inches and 7.3mph at 90 cadence) and max of 4.55 (123.8 inches and 33.2mph at 90 cadence). The gearing is perfect for my road riding but for steep trail or bike camping/adventure touring a 48-32t or even 46-30t chainring might be better.

Speeds at 90 Cadence

At a pedaling cadence of 90 RPM the bike will go a minimum of 7.3mph in the lowest gear and 33.2mph in the highest. Cassette gears are: 11-speed, 11-13-15-17-19-21-23-25-27-30-34t.

The carbon fiber frame and fork do a great job of smoothing out the road and the bike handles great. The bike is stable and it's easy to ride with no hands. I was pleasantly surprised that the aggressive cockpit position ended up being fairly comfortable. I was planning to replace the slender, lightweight seat but after getting some saddle time I'll probably keep it.

Don't remove the front disc caliper spacer until after the caliper is installed loosely and the wheel is ready to go on. With the wheel and brake disc installed and while applying the front brake, tighten the caliper bolts. This will center the caliper on the disc.



My only complaint is that the bike came with generic assembly instructions which did not address the special tool needed to install the front brake disc or give torque values for the seatpost clamp, handlebar stem and brake caliper bolts. It's important to use a torque wrench when tightening seatpost clamps and when bolting anything into a carbon fiber frame. The fork has a carbon fiber steering tube so torque the stem clamp bolts to 4 to 5Nm (35 to 44in-lb). It seems 4 to 6Nm (35 to 53in-lb) is typical torque for a carbon fiber frame seatpost. I applied some carbon fiber grip paste to prevent seatpost slippage at 4Nm. Brake caliper bolts typically get 8 to 10Nm (71 to 88in-lb). Luckily I had the required lock ring tool for the brake disc (see photo below). Torque the disc brake lock rings to 40Nm (30ft-lbs).

The front brake disc needs this "lock ring remover", Bikehand #YC-126-1A (available on Amazon and eBay), to install and torque to 40Nm (30ft-lbs).

The DT Swiss E1800 wheels are tubeless ready and have tubeless tape already in place and tubeless Presta valves come with the bicycle. I removed the tubes, installed the valves and added Stan's No Tubes Sealant after a couple of rides with tubes. I will probably replace the handlebar with a full carbon aero drop bar. Other than that the bike is just about perfect for my needs.

Sexy, crazy light and ready to go. Don't forget to oil the chain. The tire pressure listed on the sidewall is 45 - 70psi. In this photo I haven't yet leveled the seat or adjusted the seat height.

 

Carbon fiber frame made in Taiwan. Check out the fork clearance beyond the 35mm wide tire. Clearance in the rear is about the same. Motobecane lists the max tire width at 41mm but owners say 45mm fit fine.

I love this bike and when it's time to replace my old Cannondale Super V mountain bike I'll be back to bikesdirect.

P.S. I have no affiliation with BikesDirect.com, I'm just a happy customer.


Specs From BikesDirect.com

Frame: SuperRoad Disc Brake 700c Carbon (Unidirectional Weave) Road UPPER 1-1/8"/LOWER 1.5" TAPER H/T FRAME .RC: 430mm, HEAD TUBE: T CARBON UPPER 1-1/8"/LOWER 1.5" TAPER (48x42/57x52.1mm) L: 51/53/55/57/59CM=120/140/160/180/200mm

Bottom Bracket Shell: BSA68 Threaded, DROPOUTS VERTICAL W/REPLACEABLE HANGER, W/160 POST DISC MOUNT, THROUGH Axle /M12xP1.5. , 12x142MM

Bottom Bracket: SHIMANO SM-BBR60, RIGHT LEFT (BSA), BEARING, INNER COVER

Fork: 12MMxP1.5 THRU-Axle, CARBON UNIDIRECTIONAL WEAVE BLADE 700C, Threadlesss Steerer: CARBON 1-1/8" to 1.5" Taper. CROWN: 57mm, BLADE: CARBON STRAIGHT W/FLAT DISC MOUNT FOR 160 ROTOR W/55mm OFFSET, FORGED DROPOUTS. Fits up to 700x41c Tires

Crankset: SHIMANO FC-R8000, ULTEGRA, 2X11-Speed, HOLLOWTECH 2, 50/34T, 170/172.5/175mm for 51-53/ 55 /57-59cm

Pedals: BLK ROAD PEDAL W/9/16" CNC CRMO AXLE

Front Derailleur: SHIMANO FD-R8000, ULTEGRA, FOR REAR 11-SPEED, DOWN-SWING, 34.9MM BAND

Rear Derailleur: SHIMANO RD-R8000, ULTEGRA, GS 11-SPEED, TOP NORMAL SHADOW DESIGN, COMPATIBLE WITH 28-34T DOUBLE

Shifters: SHIMANO SHIFT/BRAKE LEVER, ULTEGRA ST-R8020 Hydraulic 2x11 Speed

Cassette/Freewheel: SHIMANO CS-HG800-11, 11-SPEED, 11-13-15-17-19-21-23-25-27-30-34T

        34/34 = 1.00 (27.24" 7.3mph)   50/11 = 4.54 (123.8" 33.2mph)

Chain: SHIMANO CN-HG701-11, FOR 11-SPEED 112 LINKS, W/END PIN

Wheelset: DT SWISS E1800 SPLINE db 23 WHEELSET

Rims: DT SWISS 700c ALLOY BLACK ANOD. SLEEVED TUBELESS READY W/FV, 622x20mm, IS 6-BOLTS ADAPTER, (SHIMANO) (1655g )

SPOKE DT SWISS STRAIGHTPULL DT NEW AERO & DT AERO COMP, BLACK , F/R: 24/24PCS S.S. 2 CROSS W/DT ALUMINUM NIPPLES

F/HUB DT SWISS SPLINE ALLOY BLACK db HUB 24H. (CENTER LOCK) OL: 12x100MM

F.HUB THRUaxle QR264F 12mm ANODIZED BLACK L:M12xP1.5x118.5mm

R/HUB DT SWISS SPLINE ALLOY BLACK db HUB 24H. (CENTER LOCK) 3 PAWL, OL: 12x142MM, SHIMANO 11-SPD

R.HUB THRUaxle QR264R-X12mm ANODIZED BLACK, 12x142, L:M12xP1.5x160.5mm

Tires: Schwalbe G-ONE Allround MicroSkin, TL-Easy, 700cx35 (41c max width) (diameter 27.24"), Folding Bead

Brakes: SHIMANO ULTEGRA, ST-R8020/ BR-R8070 FOR 160mm ST R81 ROTOR, RESIN PAD, torque caliper bolts 8Nm, 10Nm max, Brake Disc 40Nm using special tool

Brake Levers: SHIMANO ULTEGRA INTEGRATED ST-R8020 Hydraulic

Handlebar: RITCHEY WCS LOGIC II 7050AL ANATOMIC DROP W/TUNNEL BUILT IN, B/CENTER:31.8mm 400/420/440mm FOR 51-53/ 55 /57-59cm, D/R:125/72,132/78,144/82mm, BB BLK

Stem/Headset: RITCHEY WCS C-220 84/6D ALLOY2014 / SS Bolts TIOGA-OS, EXT:(-6) 70/80/90mm FOR 51-53/55 /57-59CM, C/S:31.8/28.6x42mm, BB BLK (22lb-in top cap bolt)

Tape/Grip: Motobecane Black Gel EVA Synthetic Cork

Saddle: RITCHEY COMP STREEM 132 BLACK Synthetic Leather, Nylon + GF Shell, Steel Rail

Seat Post: RITCHEY WCS 1B 20mm offset OS, ALLOY 2014-T6 3D FORGED 31.6 X 350mm, BB BLACK

Seat Clamp: Aluminum with bolt 4-6Nm torque.

Sizing Guide

Most riders 5'2" to 5'5" fit the 51cm

Most riders 5'6" to 5'8" fit the 53cm

Most riders 5'9" to 5'11" fit the 55cm

Most riders 6'0" to 6'2" fit the 57cm

Most riders 6'2" to 6'4" fit the 59cm


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