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Old 27 April 2013, 02:55   #1
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Unusual Trailer Wheel

Need to source a spare wheel, tried all the usual websites with no joy!


500-10c
4 stud
3" PCD
2.5" centre hole

The PCD has been measured by a 3rd party, so I think I may need to check this as I cannot source one anywhere.
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Old 27 April 2013, 03:13   #2
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Hmm, check that PCD measurement. A common mistake, on four stud wheels, is to measure adjacent studs, rather than diagonally opposites. Sounds like that's what's happened.

See the 'stickies' in the trailers and towing section for how to measure a PCD. Right down the bottom of the page, on the first post, IIRC. All the best.
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Old 27 April 2013, 03:22   #3
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Quote:
Originally Posted by Trailer Guy View Post
Hmm, check that PCD measurement. A common mistake, on four stud wheels, is to measure adjacent studs, rather than diagonally opposites. Sounds like that's what's happened.

See the 'stickies' in the trailers and towing section for how to measure a PCD. Right down the bottom of the page, on the first post, IIRC. All the best.
The PCD was measured by someone else! I will check it myself.
Thanks
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Old 27 April 2013, 03:46   #4
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Can't be 3" pcd with 2.5" centre hole. Think about it. Gotta be 4"
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Old 27 April 2013, 04:03   #5
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Good point - just done the schoolboy maths!


I will measure this myself next weekend and go from there!
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Old 30 April 2013, 08:17   #6
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+1

Maths
- assuming he's measured adjacent:
Trig on a right angled triangle <Long side>^2 = <Short side 1>^2 + <Short side2>^2

So, assuming 3" between adjacents,
<Long side>^2 =3^2 + 3^2 = 9+9 = 18
so long side (opposites) = sqrt(18) = 4.2"

0.2" is about 5mm - There's enough tolerance in there to explain measurement between inside edges of the studs as well)



....and if he has measured it right I suspect you'd be much cheaper repalcing the hubs as well!
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Old 01 May 2013, 14:09   #7
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The moment of inertia with the engine up is at the very top of the transom, putting more force on the top as the trailer goes over bumps etc. I.e all the engine weight is above the transom, engine and leg.
With the engine down more weight is lower down the transom so reducing the dynamic forces on the transom.
The engine lifts the transom in service around 10% of its thrust ...

Engine down is easier on the transom. Unless you hit something, then it may rip the transom off ect.....
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Old 01 May 2013, 15:03   #8
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Quote:
Originally Posted by 9D280 View Post
+1

Maths
- assuming he's measured adjacent:
Trig on a right angled triangle <Long side>^2 = <Short side 1>^2 + <Short side2>^2

So, assuming 3" between adjacents,
<Long side>^2 =3^2 + 3^2 = 9+9 = 18
so long side (opposites) = sqrt(18) = 4.2"

0.2" is about 5mm - There's enough tolerance in there to explain measurement between inside edges of the studs as well)



....and if he has measured it right I suspect you'd be much cheaper repalcing the hubs as well!
+1........if you see what I mean.
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