Changing gears becomes easier, effortless and faster with Di2 by simply touching the shift buttons. Control at your fingertips. Additional benefits include an automatic trimming front derailleur, great accuracy plus easy adjustment and installation. Di2 continues its great success with Shimano Ultegra. And it makes no difference if these roads are cobbles, tarmac or mud.
I'm able to neutralise any road vibration with the help of my tight rear design with relatively thin seat stays and slightly higher chain stays, ensuring that none of the driving force is lost. The use of tube profiles with unique carbon-based properties allows us to work together to lead the pack on any kind of terrain and to beat out the competition! With my slightly curved front fork, bends are not a problem but simply a challenge. I am Isaac Proton. I will steer you to your greatest successes!
Isaac Proton Di2
General
Frame Sizes: 50, 52, 54, 56, 58, 60, 62
Weave: 3K Monocoque
Frame
Bracket: Pressfit (BB86,5/42mm)
Frame Technical Specifications
Headset: 1 1/8 - 1 1/2 Tapered
Seatpost: Isaac Carbon 31,6mm
Fork
Fork: Isaac 3K Monocoque
Bike Specifications
Group: Ultegra 6770 Di2
Crankset: Ultegra 6750 compact 34-50
Wheel set: FFWD F6R/DT 240 Isaac Branded
Tires: Schwalbe Ultremo ZX
Saddle: Selle Italia SLR XP
Handlebar tape: Lizard Skins DSP 2.5mm
Handlebar: Ritchey WCS Logic II
Stem: Ritchey WCS C-260
Weight sample bikes
7.790 size 56 black
| Dimension | size 50 | size 52 | size 54 | size 56 | size 58 | size 60 | |
| A | seat tube total lenght | 480 | 520 | 540 | 560 | 580 | 600,1 |
| A2 | seat tube joint | 439,9 | 470,6 | 494,9 | 513,3 | 519,8 | 542,1 |
| B | top tube lenght | 510 | 525,2 | 545,2 | 557,9 | 570 | 595 |
| C | seat tube angle | 75° | 74.5° | 74° | 74° | 73.5° | 73.5° |
| D | head tube | 124 | 144 | 160 | 176,5 | 189 | 214 |
| E | head tube angle | 71° | 72.5° | 73° | 73° | 73.5° | 73.5° |
| F | BB drop | 75 | 70 | 70 | 70 | 70 | 65 |
| G | BB to front wheel | 604,2 | 577,8 | 588,9 | 601,8 | 603,2 | 603,2 |
| H | chain stay | 406 | 406 | 406 | 406 | 406 | 406 |
| I | wheel base | 972,5 | 973,5 | 984,6 | 997,6 | 1000 | 1027,3 |
| J | fork rare | 43 | 43 | 43 | 43 | 43 | 43 |
| K | standover height | 746,7 | 769,9 | 787,7 | 797,2 | 825 | 849,2 |
| L | standover height offset | 122,9 | 132,5 | 142,4 | 147,9 | 158,3 | 164 |