Thanks Paul, Tom and Don for your help.  

The question arose because I'm considering custom ordering some Black Beetle 
power trucks, and then picking them up when I visit Australia in March. 
 Re-reading their ad I see I should have realized the stated specs separated 
the 
contour (RP25) from the width  (110/88).  Now I only have to decide if I want 
to 
go 110 or 88.

Jim



________________________________
From: Paul Vaughn <[email protected]>
To: [email protected]
Sent: Fri, January 21, 2011 4:14:44 PM
Subject: Re: {S-Scale List} Comparing wheel treads.

  
Jim: RP 25 is a Recommended Practice for wheel contour. In PR 25 there are 
several sizes of contours which Code 110 is listed. RP 25 has nothing to do 
with 
wheel diameter only with the tread contour. A code 88 wheel is almost perfect 
size for S scale contour.  NWSL sells a 33" code 110 for S scale. I have a 26" 
dia code 88 wheel set for Sn3. 

 
So to answer your question: a code 110 will have the PR 25 contour. Its the 
same 
wheel.
 
Paul

--- On Fri, 1/21/11, Jim and Cheryl Martin <[email protected]> wrote:
 
Guys:

This is a simple case of me being too lazy to look it up myself, but in 25 
words 

or less, what's the difference visually and operationally between code 110 
wheels and RP25 wheels?  Is one more prototypically-proportioned for S-scale? 
Any operational problems on running RP25 wheels that have been re-gauged to S?

Thanks
Jim

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