Bicycle Mechanics - Chainring bolts stripped
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08-19-09, 04:15 PM
Trying to turn my old specialized hard rock into a single speed. The chainring bolts are stripped, so I used a screw extractor which got the bolt turning, but the nut turns too. There is no slot on the nut for a chainring bolt tool. Any suggestions?
08-19-09, 04:23 PM
there is no slot for the spanner? you are talking about the middle and big ring right? that is odd. there should be slots to us a tool something like this http://www.ochsnerusa-store.com/proddetail.php?prod=CA-7130005
I would spray the bolts from the back with a penatrating oil then try the allen wrench (if you still can) using a big screwdriver between the rings to apply pressure to keep the nut from turning
08-20-09, 07:53 PM
if they are already spinning it is hard to drill them
08-20-09, 08:03 PM
I had to drill some out of an old Peugeot. I think you could probably wedge a screwdriver in there somehow to stop the spinning, that is, if they spin when you drill.
use another screw extractor on the backside nuts. :innocent:
try holding the nuts with a pair of locking pliers.
08-20-09, 09:43 PM
I have a feeling that the chain ring "bolts" are actually rivets. I've seen them where they look like a regular hex recessed crank bolt but they are riveted on the other side.
Can you post a pic of the front and back of the crankset?
08-26-09, 10:19 AM
Thanks for all the replies. Yes, the "bolts" were actually rivets. I found this out after drilling one of them out. I successfully drilled all of them out.
I'm assuming I can put regular (albeit shorter) bolts to replace these?
Now on to the next project--a cassette that won't budge. Geez...seemed like an easy enough project at first.
08-26-09, 10:53 AM
Standard bolts should fit and if they don't get the drill back out;)
I assume you mean the freewheel won't budge. If it is a freewheel, make sure you have the right extractor and use a skewer to hold it tight. Either hold the extractor with a vise and try to turn the wheel or get a big wrench and a cheater bar for more leverage. Using some penetrating oil (Kroil, etc. not WD-40) might help too.
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