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1:24 scale, by INTERNAL DIAMETERS
or see these castings ARRANGED BY TURNED TREAD DIAMETER
or see the GALLERIES of IMAGES:   PLAIN,   DRIVING WHEELS

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TREAD DIAMETERS are a fairly good guide to wheel size, but remember that due to apparent tyre thickness varying from wheel to wheel by 3 to 5 inches, you will need to refer to the diagrams to find the internal diameters and to see the machining allowances on the castings.

Scales: H = 1:24 (1/2"=1 foot).

H101, H102, H103, H104, H247, H247X, H248, H248X, H249, H250, H251, H259, H329, H330, H331, H332, H333, H413, H414, H415, H421, H422, H423,

Finding the right casting size if you know the apparent tread.

Look for the casting i/d which matches your model diameter on the tread (the normal nominal o/d), less TWICE the apparent tread at your scale.

Example: 5'0" nominal dia. wheel with a 3½ inch apparent tread at a scale of 1:32.
Model dia on tread = 47.6 mm, twice the apparent tread = 5.6mm, so your target casting internal dia is 42.0 mm.

There is some variation in the castings, but the measurements are usually accurate within ± 0.1 mm.

CASTING Dia.
Proto.
Spokes Plain
or
driver
Pin Cast
wts
Tread
dia
mm.
Casting
i/d
mm.
Wheel data
with image
Stock
H 333 2' 6" Disc Plain - No SAR class 24 31.8 24.2 Wheel data Stock
H 103 2' 6" 8 oval spokes Plain - No SAR 4-8-2 15F. 31.8 25.2 Wheel data Stock
H 421 2' 9" 8 oval spokes Plain - No NRZ/RR 4-6-4+4-6-4 15th class 34.9 27.5 Wheel data Stock
H 332 2' 10" Disc Plain - No SAR class 24 tender 36.0 28.3 Wheel data Stock
H 104 2' 10" 10 oval spokes Plain - No SAR 4-8-2 15F. 36.0 29.4 Wheel data Stock
H 259 3' 7½" 12 oval spokes Driver B 10″ Yes Freelance/PNKA 2-12-2 46.1 35.9 Wheel data Stock
H329-331 4' 3" 14 oval spokes Driver B 13″ Yes SAR 2-8-4 class 24 54.0 45.9 Wheel data Stock
H 247,8,9 4' 6" 14 oval spokes Driver B 13″ Yes SAR 4-8-2 2-8-4 GMAM. (Webbed spokes). 57.2 49.1 Wheel data Stock
H 247X, 248X 4' 6" 14 oval spokes Driver B 13″ Yes SAR 4-8-2 19D. 57.2 49.1 Wheel data Stock
H422, 423 4' 9" 14 oval spokes Driver B 13″ Yes NRZ/RR 4-6-4+4-6-4 15th class 60.3 52.4 Wheel data Stock
H 413, 4, 5 5' 0" 14 oval spokes Driver B 14″ Yes SAR 4-8-4 class 25, 25 NC. (Webbed spokes). 63.5 55.6 Wheel data Stock
H 250, 251 5' 0" 14 oval spokes Driver B 14″ Yes SAR 4-8-2 15F. 63.5 55.8 Wheel data Stock
H 101, 102 5' 0" 14 oval spokes Driver B 14″ Yes SAR 4-8-2 25NC. 63.5 56.8 Wheel data Stock


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11 Sept 2014