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Old 22 February 2010, 13:53   #1
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Country: UK - England
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Distance; tyre to bunk

Hi,

I have a trailer with bunks. The wheels are below the bunks.
The boat sat on the bunks is a 4.5m Avon inflatable with wood floor, with a 25hp two stroke engine and a little aux.
The suspension units are 550kg and have two 10" 10 ply wheels on them.

The question I have is what would you expect the gap between the tyres and bunks tob?
I have come to fit the mud guards and just want to make sure the gap is right before I fit them.
Cheers,
Geoff
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Old 23 February 2010, 07:01   #2
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In theory, tyhe suspension units shouldn't go above horizontal. so measure the distance between where it's sat and the imaginary horizontal and you have a starting point.

You are likely going to be OK, as an inflatable +25Hp + trailer is likely not going to be above about 300Kg, so a 550Kg suspension is not going to to be well compressed.

You could tape some polystyrene blocks to the underside of the bunks, go for a drive & then you'll have a visual indication of how far your wheels travel upwards!
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Old 23 February 2010, 17:03   #3
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Thanks for the advice 9D280, I like the idea of towing round fully loaded, but am a way of that yet.
I think I will have to post a picture so people can see whats worrying me.
Whilst looking at a past thread I found a picture I had posted of the trailer before the new suspension, here...... http://rib.net/forum/attachment.php?...0&d=1247350668
I guess the new distance is about two inches, but will get a photo and post.
Cheers,
Geoff
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Old 23 February 2010, 19:50   #4
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You'll need more clearance than that, or your tyres will get carpet burns.
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Old 24 February 2010, 10:30   #5
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You dont have enough clearance between the tyre and the bottom of the bunk.
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Old 24 February 2010, 12:32   #6
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Just to give you some idea ,pic of my trailer,trailers in the back garden so just measured the clearence distance and its 7 cm or just under 3 inch tween tyre and inside top of mudguard and thats empty with no boat ,on 10 inch mini wheels,mines a converted motor bike trailer ,had to cut out part of the wood bunk so the mudguard to fit , i lowered the bunks down a couple of inches since that pic was taken ,
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Old 28 February 2010, 07:06   #7
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Hi again guys,
Sorry for the delay, I keep the boat at my mother in laws ( insert joke here ).
Here is a photo of how it is now (taken at night, sorry).
The gap is about 30mm. The only way I think I can change the gap is to get smaller wheels (which I don't want to do) or raise the bunks that the tubes rest on.
What is the minimum distance I need between the tyre and bunk?
I don't want to raise the side bunks too high as I am woried the keel won't rest on the centre bunk.
Cheers for your help,
Geoff
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