Broken seat collar on beater bike repair help

[L-Painter]

Hi,

I’ve had this for some time now and I bought it with the seat collar damaged. For the last 10 years I haven’t had an issue with the post slipping after cramming down some old aluminum cans to help fix it. But recently it’s not creating any tensions and seat keeps dropping down and spinning on every ride.

Wanted to ask if anyone has done any diy hacks to fix this as feels a shame to scrap the frame.

I was thinking drilling a hole through the frame and seatpost and bolting it on. I know others who have also welded the post! As it’s already in a bad state don’t mind botching it a little bit to atleast keep this out of the scrap heap!

Thanks.

 

[LondonClassic]

I would first try a virgin fresh seatpost of the correct diameter and fresh alu shims as needed. The old is bound to have worn some over the years where clamped and ovalised. I would try that first.

This doesn't look *that* beaterish to me. Some decent accessories and components hint at care and attention having been given. Winston Vaz at Varohna Frameworks will be very familiar with this era of CB and will be able to braze a new seat clamp lug on at reasonable cost (he lists it as a service on the site: https://www.varonha.co.uk/repairs/).

 

[chickendrumsticks]

Try a "cone point" grub screw. Lots on Ebay. You shouldn't have to drill the seat post but ideally drill and tap the frame or collar. Bit of red loctite, job done.

 

[novocaine]

cut off the bolt lugs and fit a collar. you might have to file the collar to go around the front.

I'm not sure whats broken here though as it looks like the bolt lugs are present and you've been using washers. what is the actual issue? if you are able to jam shims down the seattube it suggests the issue is actually the seat post is the wrong size to me.

or am I'm completely missing the point on this?