If adding brakes, does wheel size matter? - Fiberglass RV
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Old 04-15-2015, 07:07 PM   #1
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Name: Mike
Trailer: 2012 Escape 19
Posts: 5,931
If adding brakes, does wheel size matter?

Suppose a trailer has 13" wheels, with 5 on 4.5" lug pattern, and also has backer plates for attaching a brake kit. If a change were made to 14" wheels of the same pattern, would this affect the sizing of the brake kit? (Assume there's no problem with wheel well space or anything else... this is sort of hypothetical.)

Thanks in advance for your wisdom!
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Old 04-15-2015, 07:22 PM   #2
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Trailer: 1988 16 ft Scamp Deluxe
Posts: 25,604
Mike, it's about the size of the hubs. The brake pads must make contact to the hub. Which CAN be a different size than the wheel. Those are two different things. However, I've always seen where the hubs are matched to the wheel.

Those running 25-30" tires/wheels on motor vehicles are probably running the original hubs.. which means the brakes still work....
Donna D.
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Old 04-15-2015, 07:46 PM   #3
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Trailer: 2004 13 ft Scamp Custom Deluxe
Posts: 8,464
Both 10" brakes and 7" brakes with a 5 on 4.5 bolt pattern will accept all common sized trailer wheels of the same pattern.
The 7" brake hub was developed to accommodate 8" wheels such as those found on snowmobile trailers, that is why the lighter axles on many 13ft fiberglass trailers have 7" brakes even though they are commonly supplied with the same 13" wheels as their larger siblings which have 10" brakes.
13,14, and 15" trailer wheels all have adequate clearance to fit over 10" brakes which are commonly supplied on 3500# axles.
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Old 04-15-2015, 10:14 PM   #4
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Name: Mike
Trailer: 2012 Escape 19
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Great info, thanks!
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Old 04-15-2015, 10:17 PM   #5
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Name: Dave W
Trailer: Trillium 4500 - 1976, 1978, 1979, 1300 - 1977, and a 1973
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Also thanks, good info.
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