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Shimano Electric Shift R8170
It features precise infinitely variable shifting to adjust your breaks and shifts. Compared with mechanical shifting, electronic shifting is more accurate and more powerful in portability, which can greatly enhance your riding experience.

FC-R8100 Crankset
Using Hollowtech I technology to optimised power transmission as well as faster and more precise shifting operations.

Front Derailleur
The front derailleur provides ultra-smooth shifting. It moves your chain up and down perfectly, with no extra effort. The result is precise and direct shifting with no delay.

Rear Derailleur
Thinner assembly structure provides a more streamlined and integrated assembly. The pulleys are kept at a consistent distance from the cassette for improved shift stability.

Ultegra R8100 Disc Brake
Di2 components rely on wireless technology to simplify operation and ensure smooth gear changes, its deformation-resistant design makes for much less noise during braking

Professional Road Bike Seat
Slim seat shape, under the premise of lightweight can also reduce friction, the support of the seat bone is quite obvious, good breathability, long-term sitting without sweating, make riding more comfortable.
Collapsible content
Technical Specifications
Bike model |
KOOTU Di2 8170 |
Brand |
KOOTU |
Weight |
6.88kg(15.16lbs) (The weight will vary by about 1-2% depending on the size) |
Frame |
R13, Internal Cable 700C*540*142 Disc Brake Road Carbon Fiber Frame |
Fork |
R12, Internal routing 700C*100 Disc Brake Road Carbon Fiber Fork |
Rims |
Acer carbon fiber material |
Tires |
IRC 700C TPU 700*25C nozzle (F/V) 60MM |
Handlebar |
Carbon fiber integrated handlebar HB05-420 carbon fiber 420*31.8 |
Seatpost |
R13 shaped 350MM carbon fiber |
Crankset |
SHIMANO FC-R8100.12-SPEED. 2. 170MM, 50-34T W/O CG, W/O BB.BULK |
Bottom bracket |
SHIMANO SM-BB71-41B PRESS FIT TYPE FOR ROAD, RIGHT & LEFT ADAPT BULK |
Chain |
SHIMANO CN-M8100, 108L.12-SPEED, W/QUICK-LINK, BULK |
Left shift lever |
SHIMANO ST-R8170(L), BR-R8170(F), FOR 140MM. 800MM. 3 GROUP, BULK |
Right shift lever |
SHIMANO ST-R8170(R), BR-R8170(R)25MM.1500MM.3 GROUP, BULK |
Front derailleur |
SHIMANO FD-R8150.12-SPEED. CS-ANGLE: 61-66. GEAR: 50-54T, CL: 43.5MM, BULK |
Rear derailleur |
SHIMANO RD-R8150.12-SPEED.W/TL-EW300, 3RD GROUP, BULK |
Flywheel |
SHIMANO CS-R8100.12-SPEED, 11-12-13-14-15-16-17-19-21-24-27-30T, BULK |
Disc rotor |
SHIMANO SM-RT70 SS 140MM.E/LOCK RING(EXTERNAL SERRATION), BULK |
Battery |
SHIMANO BT-DN300, BUILT-IN TYPE, OTHERS SPEC, BULK |
Pedals |
Sanyun CS-201A |
Saddle |
T90. Carbon fiber 3K |
Size & Geometry
Recommend size:
49cm 160cm-165cm 5.2'-5.4'
52cm 165cm-175cm 5.4'-5.7'
54cm 175cm-185cm 5.7'-6.1'
56cm 185cm-190cm 6.1'-6.2'

"WHY NOT ME"
Starting from the needs of riders, we are committed to providing riders with "professional carbon bikes with cost performance".