jdomke1
06-29-12, 06:49 PM
My son has a Pacific Cycle mountain bike that lost one of its crank arm nuts. How can I get a replacement or find out what size it was?
Bicycle Mechanics - Crank Arm Nut Missing
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.View Full Version : Crank Arm Nut Missing
rhenning
06-29-12, 06:55 PM
Any bike shop in the world should be able to give you several or call the Pacific customer help line in Madison WI and have them send you one. You can find their 800 number using Google. Roger
HillRider
06-29-12, 07:01 PM
If it's a square taper bottom bracket, the nut is most probably threaded M8x1.0 mm. Any bike shop should have a bunch lying around from replaced bottom brackets.
jdomke1
06-30-12, 01:19 AM
The bike is strange... it has a sticker on the bike that reads Murray and yet there is a model/sn sticker that says Pacific... I didn't realize they were the same. The crank has a slot but the bolt is totally round.
Asi
06-30-12, 02:14 AM
That should be the cap of the crank. - that comes with the cranks, you can get another one only from the same crankset. But just as a dust cap there are a lot of types that fits.
If one of those caps gone missing it's no biggie, the cranks are still held by the bolt as it should. The caps are there just to make a finish with the rest of the crank to look good and to be dustproof.
If one of those caps gone missing it's no biggie, the cranks are still held by the bolt as it should. The caps are there just to make a finish with the rest of the crank to look good and to be dustproof.
DannoXYZ
06-30-12, 04:09 AM
Here's a good guide to dealing with a nut-type bottom-bracket: http://www.utahmountainbiking.com/fix/crank2.htm
The BB spindle is actually threaded at the end:
http://i42.photobucket.com/albums/e346/DannoXYZ/Cycling/equipment/BottomBracketNutType.jpg
And uses a 10x1.25mm serrated flanged nut:
http://i42.photobucket.com/albums/e346/DannoXYZ/Cycling/equipment/BottomBracketAxleFixingNut.jpg
These actually work better than the higher-end fixing-bolt and washer combination. Even when insufficient torque is applied, the serrations on the nut keeps it from working loose and falling out.
The BB spindle is actually threaded at the end:
http://i42.photobucket.com/albums/e346/DannoXYZ/Cycling/equipment/BottomBracketNutType.jpg
And uses a 10x1.25mm serrated flanged nut:
http://i42.photobucket.com/albums/e346/DannoXYZ/Cycling/equipment/BottomBracketAxleFixingNut.jpg
These actually work better than the higher-end fixing-bolt and washer combination. Even when insufficient torque is applied, the serrations on the nut keeps it from working loose and falling out.
HillRider
06-30-12, 06:20 AM
And uses a 10x1.25mm serrated flanged nut:
http://i42.photobucket.com/albums/e346/DannoXYZ/Cycling/equipment/BottomBracketAxleFixingNut.jpg
Thanks for the correction. The threads I mentioned were for a bolted type spindle.
http://i42.photobucket.com/albums/e346/DannoXYZ/Cycling/equipment/BottomBracketAxleFixingNut.jpg
Thanks for the correction. The threads I mentioned were for a bolted type spindle.
Kimmo
06-30-12, 10:00 AM
Importantly, the bike shouldn't be ridden if it's missing the nut (or bolt, depending on the BB).