Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About
It is currently Mon Jun 27, 2016 8:06 pm
Recently the board software has been updated and there are some known bugs/failures:
- Avatars are currently not being displayed ✔ FIXED
- Tapatalk connection is currently broken ✔ FIXED
- Avatars cannot be uploaded ✔ FIXED

Please note that we will soon do some changes in WW board template design in case to get a fully mobile/desktop responsiveness board!
If you find more errors please post it here: http://weightweenies.starbike.com/forum/viewtopic.php?f=7&t=139062


All times are UTC+01:00





Post new topic  Reply to topic  [ 10 posts ] 
Author Message
 Post subject: Chain Drop Scratches
PostPosted: Tue Mar 06, 2012 12:48 am 
Offline

Joined: Tue Dec 20, 2011 12:43 am
Posts: 282
Location: Los Angeles, CA
This is the first time my chain has dropped so dramatically. On top of that - I managed to finish two revolutions before realizing my chain was dropped to finish off some nice scratches. I went ahead and ordered a chain guard today to stop this from happening, but now I'm looking to self-repair the finish and paint where it was messed up. The integrity of the frame is fine - but the paint in the area of the chain drop makes for a morbid horror story.

You guys typically sand - repaint - then re-lacquer? I'm a n00b to this kinda stuff, so specifics would be nice. Would you recommend a specific paint and/or lacquer? A certain grit on the sand? I'm more interested in procedure than anything else.

_________________
Cervélo S2 2012 DA9000


Top
   
 Post subject: Re: Chain Drop Scratches
PostPosted: Tue Mar 06, 2012 1:57 am 
Offline

Joined: Tue Dec 23, 2008 2:57 pm
Posts: 813
Location: NYC
If you are dropping your chain so often then it is a clear sign that your frt mech is out of adjustment…a chain catcher is not a remedy for a poorly adjusted frt mech, but simply there for emergencies. EM3

_________________
______________

My 2013 Cervelo R5


Last edited by Powerful Pete on Tue Mar 06, 2012 2:03 am, edited 1 time in total.
Deleted quote. PP


Top
   
 Post subject: Re: Chain Drop Scratches
PostPosted: Tue Mar 06, 2012 2:18 am 
Offline

Joined: Tue Dec 20, 2011 12:43 am
Posts: 282
Location: Los Angeles, CA
Hey em3 - Thanks for answering my question... really.

If you need to know - the chain dropped on a brick road. This was the first time my chain has ever dropped, and it happened on a very bumpy and nasty surface. I guess if my derailleur was set correctly though - it shouldn't matter if I was biking on the surface of the planet Mars right?

_________________
Cervélo S2 2012 DA9000


Top
   
 Post subject: Re: Chain Drop Scratches
PostPosted: Tue Mar 06, 2012 3:10 am 
Offline

Joined: Tue Oct 30, 2007 5:02 pm
Posts: 642
I wouldn't refinish anything - it is hard to do a good job if you are not a pro.
I usually take a thin Alu. sheet and cut a nice teardrop patch from it, roll it
to get it to fit chainstay and glue it on. It will protect your frame and it can
be replaced if need be. I do use chaincatcher just in case.


Top
   
 Post subject: Re: Chain Drop Scratches
PostPosted: Tue Mar 06, 2012 7:28 am 
Offline
User avatar

Joined: Sun Jun 12, 2005 10:56 am
Posts: 2673
Location: New Zealand
Post a pic and we may be able to suggest if you are likely to make the finish WORSE when trying to fix it. Alternatively, Lizard skins makes a faux carbon protector that may well completely hide the offending area AND protect it AND look good :)

_________________
Updated: Racing again! Thought this was unlikely! Eventually, I may even have a decent race!
Edit: 2015: darn near won the best South Island series (got second in age
-group)..woo hoo Racy Theremery is back!!


Top
   
 Post subject: Re: Chain Drop Scratches
PostPosted: Tue Mar 06, 2012 7:34 am 
Offline
User avatar

Joined: Sat Nov 14, 2009 6:30 am
Posts: 856
Location: So Cal
^^That would be my vote. Trying to fix the scratches could make it worse. Something similar happened to my S2 recently. :noidea:


Top
   
 Post subject: Re: Chain Drop Scratches
PostPosted: Tue Mar 06, 2012 10:23 am 
Offline

Joined: Sat Nov 20, 2010 6:06 am
Posts: 935
Location: Perth, Western Australia
I use "helicopter rotor tape" on my chain stays. It is a thick clear tape and once cut and stuck on is nearly invisible. It does a fantastic job. I also use a chain catcher as added security.
If you do an Internet search there are a few companies that do really good touch ups, or if not too bad just cover with a stick on chain stay protector. It always sucks to have damage on your bike, but sometimes can t be avoided

_________________
Ozrider - Western Australia
Parlee Z5 XL (6055g/13.32lbs) Trek Madone 5.9 (7052-7500g)Jonesman Columbus Spirit (8680g)
Chase your dreams - it's only impossible until it's done


Top
   
 Post subject: Re: Chain Drop Scratches
PostPosted: Tue Mar 06, 2012 5:26 pm 
Offline
User avatar

Joined: Thu Dec 15, 2011 7:14 pm
Posts: 8
Location: Escondido, CA
As others have mentioned, I think the easiest and cheapest solution is to just use a chainstay protector that covers the blemished area. We can easily do the cosmetic work, but you're looking at a minimum of $75. Besides, the blemish is in an area that's very hard to see and can easily get damaged again.

If you want to take on the repair yourself, the procedure would be to use 150 grit to remove the chipping/flaking area so that it has a perfectly smooth, beveled transition to the non-damaged area around it. Feel out with your finger. If you can feel a lip from the sanded area to the undamaged area, it will show up in the finish. It's got to be smooth. Once you get it smooth, then use 320 grit to sand out the 150 grit scratches. Then use an automotive grade clearcoat to finish. I would recommend airbrushing, but if you're careful you can probably rattlecan it. Let the repaired area cure. If you can heat it up to 130 degrees, it will cure in about 5 hours. At a temperature of 70 degrees, it will probably take a day. Either way, let it sit overnight. If there are any runs, wet sand them out with 600 grit, then use a polishing wheel and a good quality polish to shine it up.

Like I said...just put a chainstay protector on it and save yourself a bunch of time and money! :wink:

_________________
Kurt Gensheimer
CarbonFrameRepair.com
Your source for quality, professional carbon fiber bicycle repair
Like us on Facebook


Top
   
 Post subject: Re: Chain Drop Scratches
PostPosted: Tue Mar 06, 2012 5:40 pm 
Offline

Joined: Tue Dec 20, 2011 12:43 am
Posts: 282
Location: Los Angeles, CA
Thanks for the tips. I think I'm going to reconsider the finishing job per recommendations from you guys. I'll go ahead and get that protector and maybe put the re-finish job off for a cold and lonely offseason. Thanks everybody.

_________________
Cervélo S2 2012 DA9000


Top
   
 Post subject: Re: Chain Drop Scratches
PostPosted: Wed Mar 07, 2012 6:29 pm 
Offline

Joined: Sun Oct 19, 2008 12:40 pm
Posts: 241
Location: England
I loved the first response....ask a simple question.
Back to the task in hand....
I tried patching some damage up, and like yourself a noob in this field of work, I made a complete arse of it, being a perfectionist its wasn't to be.
So I took it off to a car bodywork repair shop....did the job perfectly, a lot cheaper then I expected, £30.
Steve


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 10 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. FSA Team Chain vs Dura Ace Chain

in Road

ParisCarbon

8

1061

Wed May 04, 2016 4:10 pm

madcow View the latest post

There are no new unread posts for this topic. Aero Drop Bars

[ Go to page: 1 2 3 ]

in Road

campbellrae

35

4403

Sun Apr 03, 2016 9:15 am

muntos View the latest post

There are no new unread posts for this topic. 7.7 TREK Madone Need to drop weight

in Road

edualonso

5

551

Tue Aug 11, 2015 9:26 pm

FIJIGabe View the latest post

There are no new unread posts for this topic. Flat top compact drop bar advice

in Road

Devon

11

562

Wed Mar 16, 2016 12:35 pm

audiojan View the latest post

There are no new unread posts for this topic. Road bike Handlebar with 22.2mm drop tubes?

in Road

andreszucs

8

295

Sat Apr 30, 2016 11:21 pm

MisterMuncher View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: Baidu [Spider], Bing [Bot], Google [Bot], Lars D., nigel379, Olivv, Yahoo [Bot] and 29 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited