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Avenger R8RS Complete Bike
Underdogs note: This is a build-to-order listing. Choose your Shimano Di2 groupset below — each bike is assembled around the UCI-approved R8RS frameset and quality-checked before dispatch.
The Avenger R8RS Complete Bike turns the UCI-approved R8RS aero frameset into a ready-to-race road machine. Every build pairs the T47-equipped carbon frame with the distinctive R8RS Y-shape handlebar (clip-on aero-bar compatible), UAM 50 mm carbon-spoke wheels and Continental GP5000 tubeless tires — you pick the electronic groupset: Shimano 105 Di2, Ultegra Di2 or Dura-Ace Di2.
Avenger R8RS Complete Bike — Features & Benefits
- UCI-approved aero platform: the R8RS frame is on the UCI approved list — race it anywhere road bikes race.
- Y-shape handlebar: ergonomic riser design that relieves shoulder and neck strain on long rides, and accepts clip-on aero bars with no cockpit swap.
- UAM 50 mm carbon wheels: carbon-spoked 50 mm clinchers with 12-speed disc hubs on every build tier.
- Three Di2 build tiers: same frame, wheels and finishing kit — only the groupset changes.
- Modern standards: T47 bottom bracket, UDH hanger, 142/100×12 mm thru-axles, flat-mount discs, titanium frame bolts.
- Race-ready finishing kit: GP5000 tubeless tires, 3D-printed carbon-rail saddle, carbon cage, ultra-light bar tape and pedals included.
Avenger R8RS Complete Bike — Build Options
Shimano 105 Di2 (R7170) — base
- Shifting: 105 Di2 2×12, FC-R7100 52-34T, CS-R7101 11-34T
- Brakes: BR-R7170 hydraulic disc, SM-RT70 140 mm rotors
- Wheels: UAM 50 mm carbon-spoke clinchers
- Price: $3,999
Shimano Ultegra Di2 (R8170)
- Shifting: Ultegra Di2 2×12, FC-R8100 52-36T, CS-R8100-12 11-34T
- Brakes: BR-R8170 hydraulic disc, SM-MT800 160 mm rotors
- Wheels: UAM 50 mm carbon-spoke clinchers
- Price: $4500 (+$501)
Shimano Dura-Ace Di2 (R9270)
- Shifting: Dura-Ace Di2 2×12, FC-R9200 52-36T, CS-R9200-12 11-34T
- Brakes: BR-R9270 hydraulic disc, SM-RT900 160 mm rotors
- Wheels: UAM 50 mm carbon-spoke clinchers
- Price: $6000 (+$2001)
Avenger R8RS Complete Bike — Specifications
Frame Platform
- Frame: Avenger R8RS aero, Toray T800 + T1000 carbon
- Fork: Avenger aero disc road fork FO319
- Routing: fully internal
- BB: T47
- Hanger: UDH
- Axles: 142×12 / 100×12 mm
- Frame bolts: titanium
Cockpit / Wheels / Tires
- Handlebar: R8RS Y-shape riser (clip-on aero-bar compatible)
- Seatpost: R8RS dedicated aero, 400 mm
- Wheels: UAM 50 mm clincher, carbon spokes, 12s disc hubs
- Tires: Continental GP5000 tubeless 700×28C
Available Sizes & Finish
- Sizes: 49 / 52 / 54 / 56 / 58 cm
- Finish: UD carbon
- Saddle: 3D-printed, carbon rails
- Warranty: 2-year frameset warranty
Avenger R8RS Complete Bike — Geometry
| Size | 49 | 52 | 54 | 56 | 58 |
|---|---|---|---|---|---|
| Recommended Height (cm) | 155–168 | 168–175 | 172–182 | 180–188 | 185–195 |
| Seat Tube / S (mm) | 456 | 480 | 502 | 525 | 548 |
| Seat Angle / SC (°) | 74.5 | 74 | 73 | 73 | 73 |
| Top Tube / O (mm) | 509.5 | 525 | 550 | 564.7 | 580.5 |
| Head Tube / HS (mm) | 97 | 115 | 137 | 158 | 181 |
| Head Angle / HC (°) | 71.7 | 72.5 | 72.5 | 73.3 | 73.3 |
| Fork Length / F (mm) | 372 | 372 | 372 | 372 | 372 |
| Fork Offset / OT (mm) | 45 | 45 | 45 | 45 | 45 |
| Wheelbase / WB (mm) | 958.5 | 962.9 | 978.9 | 986.4 | 1002 |
| Front Center / FC (mm) | 564.5 | 569 | 584.2 | 591.6 | 607.1 |
| Rear Center / RC (mm) | 405 | 405 | 405 | 405 | 405 |
All dimensions in mm unless noted (°). Manufacturer-published chart — same geometry as the R8RS Aero Frameset.
Helpful Links
Compare geometry with other bikes on Geometry Geeks.
Browse complete bikes and components.
Frame-only option: Avenger R8RS Aero Frameset.
Avenger R8RS Complete Bike — FAQ
Which groupset should I pick?
105 Di2 gives you the full electronic-shifting experience at the best price; Ultegra Di2 trims weight and adds refinement; Dura-Ace Di2 is the flagship race option. Shifting logic is identical across all three.
Is the frame UCI approved?
Yes — the R8RS frameset is on the UCI approved-equipment list, so the bike is eligible for sanctioned road racing.
Can I fit clip-on aero bars?
Yes. The R8RS Y-shape handlebar is designed to accept clip-on extensions directly — no cockpit replacement needed.
Can I change chainring, cassette or crank length?
Yes — select your preferences in the options, or leave a note at checkout and we will confirm before the build is finalised.
How does shipping and import duty work?
Orders ship tracked and insured. For most destinations we ship DDP (duties pre-paid) where available, so there are no surprise charges at delivery — contact us before ordering if you are unsure about your country.
What warranty applies?
The frameset carries a 2-year manufacturer warranty against manufacturing defects, supported through Underdogs Cycling. Crash replacement support is available — contact us with your order number.
Which handlebar options are available?
Three cockpits: the stock R8RS Y Shape Handlebar, the Y Shape bar with rest-bar attachments (+$170) for a triathlon-style tuck, or the AVENGER ICON integrated road handlebar. Bar sizing selectors appear based on your choice.
