Origin8 Alloy Crank Arm Set (110 BCD)

Replaced a set of 170mm on my 2 speed commuter bike. Went with the 155mm to help my prosthetic knee get over the top of the pedal stroke, amazing how different it feels and how much better my knee feels now. As far as the part itself they mount easily if you have the correct tools to pull the old ones and mount the chain ring, seem to be built pretty good, time will tell. So far so good though.

Shorter crank arms are highly recommended if you are under 5'8" or so. I'm 5'7". My measured inseam is 30 1/2". 160mm is very short. I ended up going with a 165, which is more common. With the 160s I could spin like crazy and not get winded, and my knee angle was more comfortable, but i lost power - not just from the length, but also the shorter pedal stroke. 160s form a pedal circle diameter that is 2 cm shorter than 170s. Keep in mind that you will have to raise your saddle and move it back about a cm to compensate for the difference in length. The crank arms are fine, but the alloy is soft, so you have to be careful with your crank extractor.

You can’t go wrong with Origin8; sturdy, decent quality, and doesn’t cost an arm and a leg.

Photos attached are from 2 different sets. Photo with it in my hand is from the 1st pair that broke, the one still on my foot is from the 2nd pair that broke Feb 2018 : These crank arms lasted me around 4,000 miles (9 months) and then my drive side snapped in half. I haven't crashed on these arms nor have I dropped an anvil on it. It started creaking at 3,000 miles, I kept thinking it was my bottom bracket and fiddled with it endlessly. I bought another set of these because at the time I didn't know if anyone else made crank arms these short, but there are many more sellers on Amazon that sell short crank arms at roughly the same price. That being said, I'm still a strong advocate of shorter crank arms for people with shorter legs/strides Oct 2018: After the first set failed, I decided to give these another shot, hoping that the first pair were just defective. Here I am, another 4,000 miles in and the drive side arm broke on me again and I crashed hard. I was coasting along at only 200 watts when it snapped so it wasn't even like it was under a lot pressure.

I'm 5'9" and I'm all torso, so I wanted to get shorter cranks for my bike. I picked the 155mm to replace the 172.5 on my road/commuter bike. I haven't found another set of cranks that offers these short lengths (and this bolt circle) at an even remotely comparable price. These fit perfectly, shifts are better than with the original Lasko cranks that came on my bike, and my legs REALLY appreciate the shorter throw. I'm much more comfortable spinning up to a higher cadence. Not to mention they match the polished aluminum of my original cranks, which I think are really stylish on my bike. Love it.

I've had these on my bike for about 500 miles now and I am super happy with their performance. My bike is a 2009 Specialized Allez and I got them when I decided I wanted shorter crank arms. They install perfectly in a few minutes without any hassle, and are significantly lighter than the Sugino crankset that comes from the factory. I'm not a small guy, I'm 180 pounds and probably closer to 200 when I'm commuting with my backpack. That said, the arms have shown no sign of weakening, cracking, or breaking, even despite the steep hills and mountain rides I've taken it on. Overall, I could not be happier with these crank arms and would recommend them to anyone who needs a replacement on any type of bike.

great for junior racers light weight alloy wouldn't suggest for pro racers , or freestyle riders nice finish & construction. Would look awesome on a cruiser.

It was shipped quickly, and in good shape. I am not sure I would use it for a bike that was being used for long rides, or really tough conditions, but for a commuter bike that you are riding around 10 miles a day, I don't know that it can be beat for the price.

It looks great and durable. It's hard to find 155mm crank arm