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Diamondback Steilacoom RCX Disc Complete Bike

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Item # DMB0007

Don't worry though, we have a lot more Pre-Configured Cyclocross Bikes in stock than that.

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Item # DMB0007


Diamondback Bicycles knows a thing or two about wet, muddy, gnarled terrain — the exact breeding ground for mean cyclocross races. Born in the Pacific Northwest, Diamondback's Steilacoom RCX Disc sheds mud, transports easily, and crushes any rock or root in its path. And the best part is that you'll rock a cyclocross-specific bike that won't break the bank.

Its frame was built with fully-butted 6061-T6 Alloy. What's a fully-butted frame? Well, when tubes are joined in this manner, rather than featuring a continuous wall thickness, the ends of the tubes are given varying widths, which in turn, creates a stronger frame. And although it sounds counterintuitive to remove metal to increase strength, frames usually fail at the joints, and butted construction decreases the stress concentration factor in the joints. Less material equals less stress, which equates to more strength. The Steilacoom frame includes a formed top tube with a flat bottom that's designed for comfortable carries. Cables are routed on top in order to prevent them from digging into your shoulder. Meanwhile, the BB386 bottom bracket creates a light, yet stiff platform for acceleration.

Designed specifically for the Steilacoom, the fork is also designed to withstand the rigors of cyclocross' mud fields, staircases, and barriers. It features carbon legs and a tapered carbon steerer tube. The steerer provides enough clearance for larger tires and even fenders, in case you decide that you want to join a group ride or two. The carbon fork helps to shave weight while increasing strength and is exceptionally responsive.

The Steilacoom RCX is no slacker in the component department either. Shimano 105 10-speed is used for the derailleurs and shifters. Drivetrain duties are driven by a FSA 46/36t Gossamer Pro crankset with a BB386 for an exceptionally stiff pedaling platform. Rounding out the back is a 12-27t Shimano CS-4600 Tiagra cassette and a Shimano 105 chain. TRP Spyre Dual Piston Mechanical disc brakes ensure that you'll stop no matter what the conditions, especially with the 160mm front and 140mm rear rotors. Meanwhile, the cockpit is comprised of Diamondback's DBR handlebars, stem, and seatpost, with a WTB Valcon Race saddle topping off the post. And lastly, the wheelset features Diamondback's new DB Equation CX wheels that are cased in Kenda Small Block 8 700c x 32mm tires.

The Diamondback Steilacoom RCX Disc is available in the color Black and in the sizes 50cm, 53cm, 56cm, and 59cm.

Tech Specs

Frame Material:
6061-T6 aluminum
Fork Material:
carbon monocoque
1.125 x 1.5 cm FSA No.42
Shimano 105
Front Derailleur:
Shimano 105
Rear Derailleur:
Shimano 105
46/36 t FSA Gossamer PRO Cross BB386
Bottom Bracket:
test ride
12-27 t Shimano CS-4600
Shimano 105
Brake Levers:
Shimano 105
Brake Calipers:
TRP Spyre Dual Piston Mechanical
[front] 160 mm, [rear] 140 mm
DBR Drop bar
Bar Tape:
DBR Race tape with Gel
WTB Valcon Race
DBR Performance Post
DB Equation RS
14g stainless steel
Kenda Small Block Eight
Tire Size:
700 c x 32 mm
Recommended Use:
cyclocross racing
Manufacturer Warranty:
limited lifetime on frame

sizing chart

Bike size by rider height


Geometry chart


Geometry Chart


Steilacoom RCX Disc

Seat Tube


Effective Top Tube






Stand Over

Head Tube


Head Tube Angle


Seat Tube Angle


Bottom Bracket Drop




50cm  50.0cm  52.5cm  52.1cm  37.8cm  76.9cm  10.0cm  71.0°  75.0°  6.5cm  42.5cm  100.0cm
53cm  53.0cm  54.0cm  54.3cm  38.0cm  79.5cm  12.0cm  72.0°  74.0°  6.5cm  42.5cm  100.5cm
56cm  56.0cm  56.0cm  57.8cm  38.2cm  82.5cm  15.5cm  72.3°  73.0°  6.5cm  42.5cm  101.1cm
59cm  59.0cm  58.0cm  60.4cm  39.5cm  85.3cm  18.0cm  73.0°  73.0°  6.5cm  42.5cm  102.7cm

Geometry Chart

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Are there fender mounts on the fork? The...

Are there fender mounts on the fork? The description mentions having room to clear a fender, but doesn't say specifically that it has mounts, nor was I able to see any in the photos.

The only fenders that would work on this type of bike would be a fender that mounts through the hole directly under the bottom of the head tube- where a regular rim brake caliper would bolt onto the fork.

It looks like only 56cm is available. Are...

It looks like only 56cm is available. Are you expecting to get 53cm in stock anytime soon?

there's a Ridley in 52 right next door for not much more

specced the same if not better:

Does this have mounts for fenders/racks?

Does this have mounts for fenders/racks?

Best Answer

It does not have mounts on that frame

When is this expected to be back in...

When is this expected to be back in stock?

We should be getting some in at the end of the March. What size are you looking for? Please respond to

Avg. ride time: 4h 26m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

DB Lust is Back

  • Familiarity: I've used it several times

I distinctly remember wasting time in elementary school reading BMX PLUS! and lusting over the Diamondback Reactors. (

Now, with Kelly McGarry's 72 ft backflip, 2nd place, and viewers choice award at the RedBull Rampage, they have rebuilt the brand into a formidable player.

I have been riding this bike for a month or so now, and have been greatly impressed. I knew Diamondback still had it, and that they would come back and produce great bikes again. This is one of those bikes. Stiff aluminum frame and a great (105 level for around a grand? YES). This bike is a great entry level cross racer, a one bike quiver, or a gravel adventure bike. I have since upgraded the seatpost and saddle to some personal preference parts, but the stock build will get you and keep you rolling for years.

I have put about 200 miles on it so far, both on and off road, and have found myself wanting to ride back on the road more and more. The frame is confidence inspiring and solid, and wide tires and disc brakes make descending both more fun and more "spicy" because of brakes that feel like brakes. Discs on road bikes are here to stay and I will only ride them from here on out.

Fit and finish of this bike is on par with bigger names, and the price can't be beat. I'm looking forward to getting a nicer set of wheels, as with bikes in this price range, thats usually the one component selection to suffer. It is a bit heavy to keep up with the fit roadies I work with, but I'm probably having more fun. I can't wait to do some bikepacking, gravel adventures, and longer rides next summer, and this race ( but with single digit temps, its trainer time.