Origin8 Single-Ring Chainring Bolts

I bought these to support my single speed conversion of a 1977 fuji S-10s. Originally I had set up the drive train to use the 42t inner front chainring, and just left the 52t chainring in place. I started to have chain launching issues, and realized it was because the cog in the rear was more aligned with the outer 52t chainring. To test this, I ran on the outer chainring for a couple weeks and experienced no chain launches, but 52x16t was a bit high.I couldn't simply swap the front two rings because the 52t front ring wouldn't fit on the inside track. Thus I simply removed the 52t chainring, and mounted the 42t ring to the outside position. To do this I needed these single bolts because my existing bolts were too wide (to accommodate two chainrings). These worked great and I've had no issues so far.Update: I lose a couple of these each season it seems like. Use loctite. Haven't had any issues with them physically failing, just vibrating loose over the course of the summer. It's tougher to catch before they fall off since there's less thread. Seems that I lose them within a day or so once they finally come lose.

Bought these for my 6ku track. Bike after changing the chainring to a vuelta 39t and mounting it on the inside of the crank. The original chainring was mounted on the outside but I switched my rear wheel to a coaster brake so in order to get the chianline straight, I mounted it on the inside as recommended by my LBS. This made the chainring bolts sit in a groove on the backside of the chainring thus requiring shorter bolts in order to even tighten down the bolts. I first grinded the female sides of the original stock 6ku bolts shorter to get them to tighten however for some reason, the 6ku bolts are slightly bigger than my metric multi tool. Maybe they are imperial? Anyway, I rounded one of the 6ku bolts so I required ordering these, even though my diy grinding fix worked well enough. To be fair, I could have flipped the vuelta chainring over, and the bolts would be spaced farther, but like I said, I rounded one so it was unusable. Plus I would like to see the brand on the outside.After receiving the origin 8 bolts I noticed they were higher quality and very hard and dense feeling. Smooth mirror like finish on the chrome. Definitely higher quality than the 6ku ones, and guess what...they fit my multi tool Allen key perfectly. I’m not sure why the 6ku ones are so loose but my LBS guy told me they skimp on little parts to save money rather than using the proper spec parts.Just a really cool trick I did was to sandwich some steel wool behind the female side of the chainring bolts so that when I tightened them down, they didn’t just keep spinning in the slot. It took me 2 hours to figure this trick out. Before that was using all kinds of tools to try and stop the female side so I could fully tighten the male side. Steel wool worked great. I almost ordered a “special” chainring bolts tool. No need. Just get the female side to stay somehow and use grease on the male bolt. For 6 bucks these are worth it and absolutely an upgrade. From what I was told by the bike mechanic and researched...you absolutely don’t want your chainring loose at all. It will wear your chainring much faster and make weird noises. Don’t skimp here. Shipped fast as well.

They are chain ring bolts. They work. Some description might be helpful. Use these single bolts for either single chain ring crank sets or the inner (small chain ring) on triple crank sets. These come with nuts that are needed for singles but not needed for the inner chain ring on a triple. Use the double bolts for the bigger two chain rings on most triples.

Ended up using my original bolts from the 3x set up and the "nut" portion of these. The original bolts were longer and able to thread into the nut further and more securely. These bolts would have work but only able to thread into the nuts about 2 threads. Used the "bolt" portion of these to thread into the unused bolt holes in the crank arm to keep the dirt out.

I have a 2-ring Shimano Sora crank on my main weekend bike. I wanted to simplify the setup and get to a 1x9 gear setup. These bolts are perfect in that they are short and allow you to run a single chainring on a spider meant to hold 2. Super simple. I didn't have any issues with stripping or durability with the Steel versions. They were easy enough to install even without a chainring tool.

Used these to mount a SRAM 40T X-Sync (1x) ring to my FSA Gossamer crank (2x) on my CX bike. Works great, look good, and holding secure. I did need to use a flathead screwdriver on the back of the bolts to hold them steady while I applied torque to the bolts. A dual hex setup (6mm/5mm) like I've seen on some other bolts would have been nicer.

Exactly as advertised. These seem to be good quality and installed with no issues. I used them to go from a compact double to a single ring (34T) on my road bike. Remove the old bolts and one chainring, install these bolts to hold one chainring onto your crank arm.

Ordered these as recommended with my purchase of a raceface chain ring, these bolts did not work on my 2015 specialized enduro with a raceface NW chain ring.These were a little short, not long enough. Guess I'll give them to a friend if they ever end up needing them, or they fit their bike.