36. MRH13-02-Feb2013-P - page 35

The NMRA categorizes Code 88 wheels as “Fine:HO”:
nmra.com/standards/sandrp/S-4_1ProtoWheels.html.
Fine: HO track tolerances are closer to Proto:87 than standard HO:
nmra.com/standards/sandrp/S-3_1ProtoTrackwork.html.
Recommendations and standards
RP-25 wheel contour:
nmra.org/standards/sandrp/S-3_2ScaleTrackwork.html.
S-3 track standards:
nmra.org/standards/sandrp/S-3_2ScaleTrackwork.html.
Proto87:
proto87.org/d/
proto87.com/what-is-proto87.html
proto87.org/p87/standards/wheels.html
2
th (N) Flange Width (F) Flange Depth(D)
Wheel
Check (K)
Max Min Max Min Max Max
0.063 0.013 0.016 0.016 0.016
1.610 0.340 0.400 0.400 0.400
0.069 0.012 0.014 0.012 0.014 0.623
1.750 0.310 0.350 0.310 0.350 15.84
0.030 0.028 0.028
0.710 0.700 0.700
Proto:87 SIG
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