Diamondback Bicycles

Serios S Bike

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An affordable time trial/triathlon superbike: the same carbon frame and fork as its Serios siblings.

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Product Details

**Shipping Information: Currently, this item doesn’t ship to APO/FPO or PO Box addresses. We’re very sorry for this inconvenience.**

Hardly an entry TT bike model, the Serios S sports the same advanced carbon frame and fork as its superbike siblings. A mix of carbon fiber weaves allow for the lightest and most responsive frame possible, giving nimble and solid ride characteristics. The straight line speed of this bike is eclipsed only by its ability to corner. Adaptable fit (comfortable for every rider on the Optum pro team—from 5’6” to 6’4”) ensures you’ll be concentrating on your cadence instead of a fatiguing body position. Outfitted with full Shimano 105 components and HED wheels, this is the most affordable Fastest Bike on the Planet. Be confident your bike is up to the task.

Full carbon Serios frame, a product of wind tunnel and real-world testing
Diamondback Serios Aero Fork, unidirectional carbon for lightweight responsiveness
Able to fit a wide range of body shapes and sizes
Designed in collaboration with KQ Studios, leaders in the aero field
A complete professional quality TT bike for a fraction of the price


Serios Aero TimeTrial Frameset, Unidirectional Carbon, 1-3/8" Taper,


Diamondback Serios Aero Fork, Unidirectional Carbon,1-3/8" Taper


FSA IS-2-138


Shimano 105, FC-5800 53/39T, 11sp

Bottom Bracket

PRAXIS PF30-Shimano Conversion

Front Derailleur

Shimano 105, FD-5800, 11sp, Braze-on

Rear Derailleur

Shimano 105, RD-5800, 11sp


Shimano Dura Ace Bar End, SL-BSR1, 11sp

Cogset (Cassette/Freewheel)

Shimano 105, CS-5800 11sp, 11-25T



Front Hub

HED Sealed Cartridge 20h

Rear Hub

HED Sealed Cartridge 24h Cassette


14g Stainless Steel


HED Flanders C2+, 20h/24h


Continental Ultra Sport II 700x23


Shimano 105 BR-5810 Direct Mount

Brake Levers

TRP 879


Resin Test Ride Pedal


Vision TriMax Base Bar 42cm w/TriMax Pro Aero Clip-on R-Bend


DBR Race tape w/Gel


DB 3D Forged,31.8mm, 7°


ISM Prologue w/Steel Rails


DB TT Aero Carbon w/Ritchey Seat Clamp


Front Derailluer Hanger, Rear Derailluer Hanger, 2x/10mm Aero Headset Spacer, 2x/15mm Aero Headset Spacer, TOP TUBE GEL PACK BAG.

Pro Build Details

Hand built and shipped ride ready in a few easy steps! Diamondback Ready Ride bikes eliminate the usual hassle of tedious at-home bike assembly, an often-ignored process that can take hours. Our program allows you to spend less time assembling your new bike and more time riding it. 

Ready Ride bikes are hand-built nearly to completion and shipped straight to you. All you need to do is put on the front wheel, seat, and pedals. Yes, the brakes are dialed in and the derailleurs are adjusted: just pump up the tires and go!