72/73 Piner - Correct Width Rear Rim

[KJDonovan]

Got a question for the folks with 72/73 Jack Piners - I am in the process of building another and was looking for a WM2 (Measures 69MM on the outside and 47MM on the inside) mudcatcher style Radelli for it.  What I am trying to determine is what width rear rim these originally came with, WM1 (measures 61MM on the outside) or WM2.

I ask because I thought they came with a WM2 (based on what's on my other JP) and the Six Days and Berkshires all had WM1's, but now I am second guessing myself – mainly because I am finding plenty of 18" WM1's in my parts stash, but no 18" WM2's.

If you're reading this and have an early JP can you measure the width of the back rim and respond to this?

Thanks,

Kevin

[Cal Alexander]

Hi Kevin, the rear wheel rim on my 72 Piner project is a WM2 Radelli. It appears to be an original rim but not certain. The Jackpiner swing arm clearance allows for the wider rim and tire in any event. Hope this helps.

[Rain Man]

Kevin I believe I have an OEM  rim I installed on my 73 JP back in 76.  I'll measure it tomorrow,

Raymond
 Down East Pentons

[Carl Hill]

I have a 36 spoke Sun rim that I am pretty sure came off a Jackpiner. It's WM2

[Pat Oshaughnessy]

Kevin My J. P. was built in November of 1972.Im 99% sure it has the original back Wheel. It is 2&1/4 inches wide outside to outside. measured with calipers Hope this helps.[]

[KJDonovan]

Thanks for the feedback gents – I *thought* all the JP's came with WM2's, but based on this, it appears some were WM1 and some WM2.  I am now guessing they just used whatever was available.  

Checked the parts manual too and it just says 18" rim without specifying the width.

If anyone comes across an Radaelli 18" WM2 in decent shape they can spare, let me know.  I want to go with the WM2, because I plan on running a 4.50 on this one.

Thanks,

Kevin

[Pat Oshaughnessy]

A fresh & crisp 175cc mtr. will pull that 4.50 tire real well![]

[Rain Man]

FWI the 2 Radelli rims I replaced on my 73 Piners back x years ago were WM1.

Raymond
 Down East Pentons