Felt IAx Advanced 105 Di2

2025 RoadTriathlon Manufacturer page

Price: Not published

Prices shown first for United States
United Kingdom: £4,899 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 34–50t / 11–34t
Gear range: 455%
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

48cm 152.4–169
51cm 166–174
54cm 171–182
56cm 179–189
58cm 186–195.5

Components

14 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.

Frame and fork

1 part

Frame

Felt IAx 1.0, UHC Advanced Not identified

Suspension

1 part

Fork
- Felt

Drivetrain

6 parts

Cassette
- Shimano 105 11–34t
CS-R7100
Chain
- Shimano SLX CN-M7100
CN-M7100
Crankset
- Shimano 105 FC-R7100 12 speeds 50/34t
FC-R7100
Front derailleur
- Shimano 105 FD-R7150 2 speeds
FD-R7150
Rear derailleur
- Shimano 105 RD-R7150 12 speeds
RD-R7150
Shifters
- TRP
HD-T910D

Brakes

2 parts

Brakes
- TRP TT HYDRAULIC
HD-T910
Disc rotors
- TRP TR-25
TR-25

Wheels and tires

2 parts

Cockpit and contact points

3 parts

Handlebar
- Devox
Saddle
- ISM
Seatpost
- Felt

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 54cm

Table

Geometry diagram unavailable

The drawing needs chainstay length, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	378	392	404	421	440
Stackmm	473	495	520	544	566
Top tube lengthmm	467	490	510	538	567
Seat tube lengthmm	489	512	538	563	586
Head tube lengthmm	63	86	109	134	157
Head tube angle	71.5°	71.5°	72°	72°	72°
Seat tube angle	79.5°	79°	78.5°	78°	77.5°
Wheelbasemm	958	980	990	1016	1042
Bottom bracket dropmm	72	72	72	72	72
Bottom bracket heightmm	264	264	264	264	264
Stack/reach ratio	1.25	1.26	1.29	1.29	1.29
Suspension and parts
Crank lengthmm	165	165	170	170	172.5

Not published by the manufacturer: Chainstay length, Front center, Standover height, Fork rake, Trail, Front travel, Rear travel, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Fork material: Carbon
Weight limit: 129 kg

284.4 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 34
Largest chainring: 50
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 29.0 in
Highest gear: 131.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Electronic

Additional specifications

Tire width: 25c
Wheel material: Carbon
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

29.0 gear inches

This value is below the central range for this class.

Cohort: Road / Triathlon Model year: 2025
Sample: 142 bicycles with this information
Coverage: 76.7% of the class

Highest gear

131.8 gear inches

This value is below the central range for this class.

Cohort: Road / Triathlon Model year: 2025
Sample: 142 bicycles with this information
Coverage: 76.7% of the class

Shifting

Electronic

148 of 185 bicycles with this information use electronic shifting.

Cohort: Road / Triathlon Model year: 2025
Sample: 185 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 11.1 km/h
Highest gear: 50.5 km/h

Total gear range 455%

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: 29.0–131.8 gear inches
Class reference (p10–p90): 30.7–142.4 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Triathlon Model year: 2025
Lowest gear: 142 bicycles with this information, 76.7% of the class
Highest gear: 142 bicycles with this information, 76.7% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2025 builds
Specification	This bicycle Felt IAx Advanced 105 Di2	Felt IAx Advanced 105	Felt IAx Advanced Rival eTap AXS	Felt IAx Advanced Ultegra Di2
Drivetrain
Smallest chainring	34	34	35	36
Largest chainring	50	50	48	52
Largest sprocket	34	34	30	30
Lowest gear	29.0 in	29.0 in	33.8 in	34.8 in
Highest gear	131.8 in	131.8 in	126.6 in	137.1 in
Cockpit
Shifting	Electronic	Mechanical	Electronic	Electronic
Other specifications
Wheel material	Carbon	Aluminum	Carbon	Carbon