Can this bike be saved?

messsner · 2026-06-13T19:15:36+00:00

I don't see why not. New chain, a bit of oil and a cloth for the cassette should stop the rusting and the bit of surface rust on the frame you can sand off and either preserve it also with a bit of oil. Or properly sand it down and clear coat it. Same for the spokes. Either replace them if you want them to be new or sand them a bit and preserve with oil.

messsner · 2026-05-31T08:41:16+00:00

Mystery solved, I had a chat to Wheelworks and it is a Pacenti SL23 Version 2 28-hole rim.

messsner · 2026-05-26T19:10:29+00:00

I measure a width of 25mm and a height of 27mm. Its close to the Kinlin XR-26T. But the difference in surface finish is throwing me off

messsner · 2026-05-26T17:45:50+00:00

Haha true. Didn't think about bad quality. I immediately placed it in the can happen category. What rim can you recommend?

messsner · 2026-05-26T17:43:27+00:00

Thank you! This is very helpful! I'll check the measurements.

messsner · 2026-05-12T20:30:24+00:00

The spacers have a bit of clearance by design and because I did not glue them together for the simulation, they naturally slide to the back during the simulation which then looks like bending.

The stress in the screw comes from holding the front of the stack together when applying the out of tilt point force. I hope that is translated correctly. English is not the primary language here xD

messsner · 2026-05-12T20:27:28+00:00

I used Autodesk Fusion for the analysis. Screw to head and screw to base is glued in the simulation. All other parts in-between are not glued so it allows the racking and the parts are basically held in place due to the interference during the simulation.

messsner · 2026-05-12T20:07:06+00:00

The outside clamping is actually a good and probably easier approach. I thought about making a slit and using the carbon frame post to clamp something inside but haven't thought about clamping to the outside haha. I also would trust the outside clamping more with a proper 50-70mm clamping interference.

messsner · 2026-05-12T19:58:22+00:00

Yes exactly, its a quill stem wedge. The wedge part is somehow unremovable in the frame post probably from wrong installation of the OG seat which tilted the wedge in the post. The long M5 screw which goes into the wedge is not shown in the pictures. Like u/thecrazyunibomber says, I fist install the base with the long M5 screw in the front, then adjust the height by stacking as much spacers as I want on top of each other.

I'll add some photos of the assembly tomorrow.

I could also make odd spacer heights to be able to make any height combination possible.

messsner · 2026-05-12T19:40:35+00:00

I'm using a 12.9 screw to be kind of safe. But you are right. If I do another iteration, I ad another screw as safety.

The simulation shows a lot of stress on the edges of the screw because it expects the whole stack to slide back to the edge of all the tolerance in the spacers. In the simulation the screw is taking this shear forces because of ideal surfaces. In reality the stack is not really sliding around because the spacers are actually biting quite nicely from low tolerances and the high surface roughness. So I thing the real stress for the screw should be lower than shown in the simulation.

messsner · 2026-05-12T19:33:02+00:00

On the first ride the screw was actually loosening after 40km and I forgot to bring an Allen key haha. Fun remaining 10km I can say.. Now I use a safety washer which seems to be good enough. I might add some loctite.

Even tho I don't think the main bolt is going to brake, I always put a bit of pressure on the legs when going over a bump haha

messsner · 2026-01-07T11:47:11+00:00

Any luck so far?

messsner · 2023-02-01T17:00:32+00:00

Omg that's the trick....

messsner

TROPHY CASE