Broken Lug Stud Rear Wheel

rick71454 · Post by **rick71454** » Tue Oct 02, 2012 11:35 pm

Hello Buddyland:

Anyone ever torque a rear lug nut so much that it broke a lug stud?
The other 4 lug studs are OK, but this one was appearently weaker, I set my torque wrench to manufacture specs too.

So what did you do? Remove the broken stud? How did you do that?
Or did you buy a new rear brake hub for about $62?

Rick71454

Robbie · Post by **Robbie** » Tue Oct 02, 2012 11:42 pm

Call the dealer or look at the parts manual to determine if the stud is even available.
If it is, you would have to remove the hub, press out the old, press in the new stud.
If there is no part listed, a drum/hub would be required.

What was the recommended torque?

Rob

rick71454 · Post by **rick71454** » Wed Oct 03, 2012 12:06 am

Hello Robbie:

Thanks for your reply......
Scooterworks does carry the lug studs cost $1.30 each. Shipping...it was something like several dollars UPS Ground.....shipping dont sound right.

Upon review, I may have set the torque wrench to high. The stud is like a 1/4 inch or 6MM. The Buddy manual does not refer to lug nuts torque, but does have a bolt size chart and torque values. The chart says .7-1.1 kgf-m, which equals 5-8 Foot Lbs.

Rick71454

Robbie · Post by **Robbie** » Wed Oct 03, 2012 1:15 am

rick71454 wrote:Hello Robbie:

Thanks for your reply......
Scooterworks does carry the lug studs cost $1.30 each. Shipping...it was something like several dollars UPS Ground.....shipping dont sound right.

Upon review, I may have set the torque wrench to high. The stud is like a 1/4 inch or 6MM. The Buddy manual does not refer to lug nuts torque, but does have a bolt size chart and torque values. The chart says .7-1.1 kgf-m, which equals 5-8 Foot Lbs.

Rick71454

Yep, you would want to use a inch pound wrench on those (60 to 90 inch pounds is the conversion).....ft lb wrench is just too inaccurate at settings below 15 ft.lb.

You might try to get Scooterworks to put one or two in a packing envelope and go USPS.....possible savings........but then again, UPS is about the same base rate for a packing envelope too.
Darn shame shipping ends up higher than the part.

Rob

rick71454 · Post by **rick71454** » Wed Oct 03, 2012 3:50 am

Hello Robbie:

I might just buy one of those inch pound torque wrenches.
And thanks for your idea of a USPS Package envelope. I think that is cheaper.

Rick71454

az_slynch · Post by **az_slynch** » Wed Oct 03, 2012 5:38 am

Does the stud thread on or press in?

If they thread in, AutoZone sells Grade 8 and the metric equivalents (10.9?) in their hardware section. Might look into that if shipping is crazy expensive. Going to re-stud the rear drum of my P200 soon; the rim has taken a toll on the studs over time.

rick71454 · Post by **rick71454** » Wed Oct 03, 2012 6:00 am

Hello Az_slynch:

I learned from Scooterworks that the lug studs are threaded. Grade 8 metal is your good choice. That is interesting that you are restuding your rear drum. For a Buddy 125, the rear drum is $62. Five studs at $1.30 each equals only $6.50. If you can do it yourself, you save alot there.

Your idea got me thinking if I should replace all 5 of my lug studs or buy a new rear drum with the studs already in it. I may have over torqued the other 4 lug studs and damaged their strength.

Rick71454

az_slynch · Post by **az_slynch** » Wed Oct 03, 2012 6:20 am

rick71454 wrote:Hello Az_slynch:

I learned from Scooterworks that the lug studs are threaded. Grade 8 metal is your good choice. That is interesting that you are restuding your rear drum. For a Buddy 125, the rear drum is $62. Five studs at $1.30 each equals only $6.50. If you can do it yourself, you save alot there.

Your idea got me thinking if I should replace all 5 of my lug studs or buy a new rear drum with the studs already in it. I may have over torqued the other 4 lug studs and damaged their strength.

Rick71454

Rick, I was re-studding the drum on my '81 P200E for two reasons. One, the studs were a bit gnarly where a loose rim had ground on them in the past. I ran a die down them to clean up the threads when I first replaced the tires and again when I switched to FA Italia aluminum rims. The rims are a bit thicker, so there were fewer threads to run a nut down on. The studs on the Vespa (and Stella's) are M8-1.25 thread, with a length of 25mm. I figured I'd go with 30mm studs to allow more thread for the retaining nuts and I could stop worrying about the thinned-out portions of those original, thirty year-old studs.