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Trick to getting chainring bolts to bite?(16 posts)

Trick to getting chainring bolts to bite?Alex-in-Evanston
Jul 30, 2002 6:15 AM
I think I may explain this rather awkwardly, so bear with me.

I can't get the chainring bolts to bite securely on their nuts. I use the chainring nut tool (a weak little pronged thing to fit the spline pattern on the nut), but it's too small and the nut breaks free before I can get the bolt clamped down securely. Is there a trick to getting this to work? I've got three single speeds in the family so I'm changing chainrings all the time.

Thanks for any help,

Alex
try greasing the threads? nmDougSloan
Jul 30, 2002 6:24 AM
I think I may have over-greased the threads...Alex-in-Evanston
Jul 30, 2002 7:38 AM
and some leaked down onto the underside of the bolt's head, causing it to spin instead of bite.

Thanks tho,

Alex
and you are using one of these...?DougSloan
Jul 30, 2002 8:02 AM
Chainring Nut Wrench http://www.parktool.com/tools/CNW_1.shtml

This tool works fantastic for me. I'm worried I'll snap the darn things I can get them so tight.

Doug
Mine only has the outer two prongs.Alex-in-Evanston
Jul 30, 2002 8:06 AM
And it doesn't seat firmly in the nut. Perhaps that center prong makes all the difference.

Thanks Doug, you've been darn helpful for such a small thing.

Alex
no problemDougSloan
Jul 30, 2002 8:33 AM
Let me add that the best way I've found to change rings, if you remove the crank, is to lay the assembled crankset down on a foam/spenco covered computer mouse pad. I have one about 18 inches square. A thick folded over towel might work, too. Then lay the little wrench under the chainring nut. As you press down and turn the outer bolt, the pressure on the wrench keeps it perfectly in place.

Doug
thanks for the tip, Dougmadstork
Jul 30, 2002 8:41 AM
I'll try the pad/towel trick next time. Better than busted knuckles and cussing any day!
Mine too...SS_MB-7
Jul 31, 2002 6:22 AM
I have a Park and Shimano spanner and both will work if the spline is wide enough to grab. I find that the center prong does nothing. Stock Shimano nuts have a wide spline and are easily grabbed by the spanner. Aftermarket nuts may or may not have wide enough splines. I've encountered this on several occassions....most recently on a set of short BMX chainring bolts used on my SS bike. Be very careful not to strip the nut splines. I find a butter knife is thin enough to get inside the spline while still being wide enough to span across both sides.

Ride Hard,
Mike B.
Merci.Alex-in-Evanston
Jul 31, 2002 12:46 PM
I checked last night and they are QBP BMX chainring bolts. I'm still having trouble with them, but at least I know they're the correct size.

Lovely new bike by the way.

Alex
Wow.SnowBlind
Jul 30, 2002 9:14 AM
I just use a hex wrench.
I feel so.. so.. deprived.
Does it double as a peanutbutter knife?
what's the purpose of this?ColnagoFE
Jul 30, 2002 9:24 AM
i've always just used a good hex wrench. seems to tighten the bolts just fine. any compelling reason to buy one of these?
sometimes the nut turns nmDougSloan
Jul 30, 2002 9:51 AM
I use live worms and small hooks.... (nm)grzy
Jul 30, 2002 10:36 AM
Single speed huh?Spoke Wrench
Jul 30, 2002 11:49 AM
Are you sure you're not using chainring bolts that are too long? My QBP catalogue has 6mm chainring bolts listed for single chainring use.
excellent point; been there nmDougSloan
Jul 30, 2002 11:50 AM
Perhaps that's it.Alex-in-Evanston
Jul 30, 2002 12:37 PM
We shall see.

Thanks,

Alex