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Description
12 Speed For The Masses
The Shimano 105 FC-R7100 Crank is a super sturdy 2x12 HOLLOWTECH II style crankset intended to be paired with the new 12-speed 105 Di2 or Mechanical groupset.
The crank comes in both a 50x34t, and 52-36t configuration. Combined with the new 11-34 and 11-36t cassettes, it delivers a low, even sub 1:1 gear combination that can help riders take on steeper slopes, and better control their efforts.
The new Shimano 105 12 Speed Di2 groupset brings the benefits of semi-wireless electronic drivetrains to their workhorse line of components. But this crank works equally well with the standard 105 12 speed groupset as well.
Pro level features are now available for every-day cyclists.
Features:
- Optimal balance of stiffness, strength, weight and rotational performance
- HOLLOWTECH II structure cuts weight yet maintains strength for better power transfer
- Crank arm length: 160, 165, 170, 172.5, 175 mm
- Gear combination: 50-34T, 52-36T
- Q-factor: 148 mm
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
Specifications
Discipline: Road | |
Speed: 12 | |
Type: 2x | |
160mm - 50/34 Teeth | Crank Arm Length: 160 mm |
Mfg PartNum: IFCR7100MX04 | |
165mm - 50/34 Teeth | Mfg PartNum: IFCR7100AX04 |
Crank Arm Length: 165 mm | |
170mm - 50/34 Teeth | Crank Arm Length: 170 mm |
Mfg PartNum: IFCR7100CX04 | |
172.5mm - 50/34 Teeth | Mfg PartNum: IFCR7100DX04 |
Crank Arm Length: 172.5 mm | |
175mm - 50/34 Teeth | Crank Arm Length: 175 mm |
Mfg PartNum: IFCR7100EX04 | |
Reviews
Bike shop said my recalled Ultegra crank did not have cracks, so they could not replace under warranty, but also said it could break any time. This did not instill me with confidence. So I bought this crank at BTD and replaced it myself. Easy and only a minor tweak required of the derailleur on my 2x11 speed. This one feels more solid when I stomp on it and I don't have to be wondering if it going to suddenly blow apart under me. The weight difference has not slowed me down. I did wait for a sale to buy this one, and it was a bargain!
I recently purchased a bike with 105 di2, but it came with a Shimano non-series crankset. I replaced the crankset with the 105 7100 before riding the bike because I knew that detail would bug me forever. Compared to the older gen 105 cranks, these are more angular and modern in appearance. From a distance, they look identical to the new Ultegra and Dura Ace cranks. Other than that, these aren't too heavy and aren't too expensive - what you expect from 105 components.
This worked well as a replacement for the damaged cranks (and a slight upgrade) on my endurance bike. Installation was really straightforward and the price seemed reasonable.
I had been using a Dura Ace 9100 crank but recent history of DA and Ultegra cranks breaking caused me to downgrade to 105. So far, I am very happy with this 105 crank. It works with 10spd chain, shifts as good as DA. The big knock about 105 is that small parts tend to break off. No small parts on the crnks. The only caution is that chainrings are not backward-compatible. You need to use current chainrings due to crank shape at spider.
Mechanic's Corner
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