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Posted by: Green626 Apr 17 2023, 11:56 AM

All,
I just purchased a set of Pedrini wheels for my 1972 1.7 - it sounds like I might need longer wheel bolts - I wanted to find out if that was required or if I can clean up and use my stock bolts.

thanks for the info

Posted by: brant Apr 17 2023, 12:00 PM

depends what bolts and wheels you had prior to the pedrini's

the stock steel wheels came with shorter bolts
all of the mag wheels came with longer bolts from the factory
so if your replacing steel... yes you will need to find used or new bolts that have the correct length... but also the correct seat-face for the wheels.

brant

Posted by: Green626 Apr 17 2023, 12:12 PM

I currently have a set of riviera wheels - looks like they use the stock 19 mm head short bolt
but it sounds like I need the longer bolts.

Posted by: brant Apr 17 2023, 12:20 PM

sounds like it.

used ones come up from time to time here.
but pretty sure I recall, someone is selling the correct ones aftermarket also...
maybe 914 rubber?

not certain... just remember seeing them somewhere available aftermarket-new

there are threads somewhere on this site with the discussion/measurement about it.

brant

Posted by: mepstein Apr 17 2023, 04:21 PM

Pretty easy to tell. Do you have about an inch of bolt showing when they are seated in the wheel. You need enough threats to secure completely through the hub flange.

Posted by: 914Sixer Apr 17 2023, 05:15 PM

You need 40mm long bolts. Measure that length from under the head. Bolts HAVE to be BALL SEAT. Here is some options. 20 pack so you get some extras.


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Posted by: rick 918-S Apr 17 2023, 05:17 PM

Also Ball Seat not tapered seat.

Posted by: Green626 Apr 18 2023, 08:25 AM

Thanks for all the great information. now on to refinishing these wheels

Nick

Posted by: dr914@autoatlanta.com Apr 18 2023, 08:33 AM

have to use 40mm shank


We sell GOOD aftermarket ones that work and they are inexpensive

QUOTE(Green626 @ Apr 17 2023, 10:56 AM)

Posted by: bdstone914 Apr 18 2023, 11:37 AM

The correct length needed for alloys is 38mm. There are several suppliers of aftermarket lug bolts but most have a 17mm hex. Original bolts usually sell for $100-150 a set. Aftermarket ones are about $4 each. Make sure you get them for the ball seat not taper seat.

Posted by: davep Apr 18 2023, 04:34 PM

Strictly speaking you only need the long bolts for the rear if I remember correctly. This is because the rear brake rotor thickness. I believe the standard bolts are long enough to fully thread in the front rotors. So a good set of used bolts for the rear would do it I think.
The other option is to fit studs in the rear rotors and use nuts; this makes it so much easier to mount the wheels.

Posted by: 914werke Apr 18 2023, 05:24 PM

Its also worth noting that unless you have a matching Alloy spare, you need to carry x4 of the short non-alloy lug bolts.
The reason being if you ever find yourself changing a rear tire & install a Steelie (common to be carried as a spare) with the long bolts vs the short ones in the rear .... bad things will happen.

Posted by: bzettner Apr 18 2023, 05:31 PM

QUOTE(914werke @ Apr 18 2023, 06:24 PM)