Dolan TDR Tandem Disc Road Bike - Alpina 105 R7170 Di2

2026 RoadEndurance Manufacturer page

Dolan TDR Tandem Disc Road Bike - Alpina 105 R7170 Di2, color Tdr Aluminium Tandem Disc Frame White (55 / 48cm)

Price: Not published

Prices shown first for United States
United Kingdom: £3,249 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 36–52t / 11–34t
Gear range: 446%
Brakes: Hydraulic disc

Sizes

Size guide

Front
Rear
H/T

The manufacturer did not publish rider heights for these sizes.

Components

12 of 15 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Suspension

1 part

Fork
- Alpina

Drivetrain

7 parts

Bottom bracket

Tthreaded Not identified
Cassette
- Shimano 105 CS-R7101-12 12 speeds
CS-R7101-12
Chain

Tandem Chain Not identified
Crankset
- Alpina 52/36t
Front derailleur
- Shimano 105 FD-R7150 2 speeds
FD-R7150
Rear derailleur
- Shimano 105 RD-R7150 12 speeds
RD-R7150
Shifters
- SunRace

Brakes

2 parts

Wheels and tires

1 part

Rims
- Mavic

Cockpit and contact points

3 parts

Other components

1 part

Fenders

None-Fitted Not identified

Sizes and geometry

3 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size Rear

Table

Geometry diagram unavailable

The drawing needs wheelbase, reach, stack, head tube angle, seat tube angle, head tube length, chainstay length and bottom bracket drop / Bottom bracket height, which the manufacturer did not publish. Available facts remain in the table.

Size

Complete manufacturer geometry table 3 published sizes

Complete manufacturer geometry by size
Measurement
Top tube lengthmm	550	650	—
Seat tube lengthmm	550	480	—
Head tube lengthmm	—	—	140

Not published by the manufacturer: Reach, Stack, Head tube angle, Seat tube angle, Chainstay length, Wheelbase, Front center, Bottom bracket drop, Bottom bracket height, Standover height, Fork rake, Trail, Stack/reach ratio, Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Fork material: Aluminum

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 36
Largest chainring: 52
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 30.7 in
Highest gear: 137.1 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Electronic

Additional specifications

Bottom bracket standard: BSA
Wheel material: Aluminum
Wheel size: 700c

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

30.7 gear inches

This value is above the central range for this class.

Cohort: Road / Endurance Model year: 2026
Sample: 479 bicycles with this information
Coverage: 79.3% of the class

Highest gear

137.1 gear inches

This value is above the central range for this class.

Cohort: Road / Endurance Model year: 2026
Sample: 479 bicycles with this information
Coverage: 79.3% of the class

Shifting

Electronic

327 of 604 bicycles with this information use electronic shifting.

Cohort: Road / Endurance Model year: 2026
Sample: 604 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 11.8 km/h
Highest gear: 52.5 km/h

Total gear range 446%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 30.7–137.1 gear inches
Class reference (p10–p90): 26.6–139.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Endurance Model year: 2026
Lowest gear: 479 bicycles with this information, 79.3% of the class
Highest gear: 479 bicycles with this information, 79.3% of the class