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PostPosted: Tue Sep 17, 2019 9:57 am 
Devout Dirtbag

Joined: Fri Oct 12, 2018 6:28 pm
Posts: 107
I am quite new here some I am always looking to learn.
Could anyone please give me their best tips when rebuilding a recently painted frame.
I am in the process of refurbishing a NTI Rock Lobster .
So prior to painting I have fitted the complete drive train and got it working (taking note of where the front derailleur fits.).I have now taken it all off and the frame has been sent for grit blasting I would of had it powder coated but it had 2 tiny dings in the frame so painting was the best option.
So has anyone got good advise about fitting it back up without doing any damage to the paintwork, any protection you put on the to stop accidents when fitting up the frame and also things like adjusting the front derailleur which could cause damage
Cheers in advance.

PostPosted: Tue Sep 17, 2019 10:11 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 9905
Location: New Forest, UK
Shake and rotate the frame to remove blasting residue from inside frame tubes. Hearing it rattle about is maddening.
Take the frame to an LBS and get the bottom bracket threads chased out to clear any blasting residue from the threads.

Get the seatpost in (no grease) and hold the frame in a workstand by the post.

Tap out all threads in the frame.

Then rebuild. Clearly wrapping the frame in old cloths to prevent scratching is a good idea.

PostPosted: Tue Sep 17, 2019 12:53 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider
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Joined: Sun May 25, 2008 11:03 am
Posts: 19298
Location: Sunny Glasgow
Thet pretty much sums it up. Though if you look and see if theres a bike charity operating near you they sometimes have programs about fixing your own bikes and this is just the job to help you.

Local week bikes shops arent available out on a trail, so being proficient to some degree in how it all goes together is extremely helpful, and cost effective.

I've often rolled the eyes at seeing a bike in the mechanics for a simple puncture or to tighten up something. :shock:

 Post subject: Re:
PostPosted: Tue Sep 17, 2019 11:39 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Thu May 06, 2010 10:05 pm
Posts: 9748
Location: Scotland
Nowadays it's common to apply clear Helitape (or similar) to the frame to protect it in high wear areas e.g.. around the headtube where cables might rub, on the chainstay (if not using a dedicated chainstay protector) etc. You might also put it on the top/down tube where cables might rub agsinst it, or even the underside of the down tube to protect against stone chips.

Wait a while until the paint is fully cured/hardened before building the frame up though.

With the Chainset fitted you can adjust the high/low stop limit screws on the front mech.

Make sure you're happy with the front mech position (e.g. does it clear the teeth on the big chainring?) Before properly tightening up the band clamp, it can sometimes damage the paint, and if you need to move the front mech position later you may expose the damaged area if paint.

Enjoy, take your time, and route the cables as best you can.

PostPosted: Wed Sep 18, 2019 12:55 am 
BoTM & rBoTM Winner
BoTM & rBoTM Winner
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Joined: Wed Jan 17, 2018 8:42 pm
Posts: 3794
Location: VCC Member 5558 East Riding of Yorkshire
Tip for the front mech clamp:
Remove a few inches of the shiny backing you get from double sided tape and wrap it around the tube when you first clamp it together if you aren’t confidant in getting it right first time. Test the mech, measure it’s relative position, then loosen and remove the protective shim.
Don’t be tempted to use masking tape or anything with adhesive as this is likely to have an effect on the fresh paint.

PostPosted: Thu Sep 19, 2019 10:20 pm 
Retro Guru
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Joined: Sun Dec 12, 2010 10:50 pm
Posts: 733
I would say wait a week at least to let the paint cure properly.

While I was building my wheels and bits during that week after lacquering my frame, I would sniff the frame and could still smell paint until about 7 to 8 days after.

PostPosted: Fri Sep 20, 2019 1:43 pm 
Retro Guru
User avatar

Joined: Thu Jul 02, 2015 2:09 pm
Posts: 748
If you are able to leave the frame for a few extra weeks just to make sure the paint can properly harden, that's always a plus. Even if it is dry, there is always an element of softness to fresh paint. Ideally 2-3 weeks in a warm room should do it.

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