Rally Chat Cycle mount tow ball

Mar 28, 2016
27
1
Lancashire
Funster No
42,184
MH
Coach build
Exp
2013
We have an Elddis Aspire motorhome plated at 3850 I have a spare payload of 130 kg back axle weight
we have a Fiamma bike rack which carries 2 bikes within this weight but the back wall of the motorhome is coming away slightly from the bathroom wall if I were to put a tow bar on and fit on a Thule Bike Rack at a weight of 40 kg will this make any difference to my back axle weight
Thanks
 
May 23, 2012
3,250
4,978
North West Norfolk
Funster No
21,175
MH
Coachbuilt
Exp
Since Feb 2012
The tow bar will add to it yes. You could put air suspension on if you’re worried and you can raise the rear of the van if tight on loading at the ferry
 
OP
Aspire
Mar 28, 2016
27
1
Lancashire
Funster No
42,184
MH
Coach build
Exp
2013
Thanks for your reply I have air suspension fitted what I am trying to say is will it increase my back axel weight by more than the 40 kilo I will have added if that makes sense
Alan
 
May 23, 2012
3,250
4,978
North West Norfolk
Funster No
21,175
MH
Coachbuilt
Exp
Since Feb 2012
What does the tow bar weigh. The bikes will stay the same minus the weight of existing rack. If you’re border line afterwards you could do things like take batteries out if they are electric or front wheel off to reduce it a bit, move the weight forward in the van.
 
OP
Aspire
Mar 28, 2016
27
1
Lancashire
Funster No
42,184
MH
Coach build
Exp
2013
The towing bracket and bike rack are approximately 40kg I have a weight bridge ticket with the bikes on of 130kg spare payload
 
OP
Aspire
Mar 28, 2016
27
1
Lancashire
Funster No
42,184
MH
Coach build
Exp
2013
Sorry what I meant was will it increase my back axle weight by more than the 40 kg with it being lower down
 

TheBig1

LIFE MEMBER
Nov 27, 2011
11,726
15,146
Dorset
Funster No
19,048
MH
A class
Exp
many many years! since I was a kid
the fulcrum effect will apply a slightly higher load on the rear axle than the immediate downforce weight of the load behind your axle. for a 40kg load it will likely be under 50kg at the rear axle and a few grammes lift at the front axle
 
OP
Aspire
Mar 28, 2016
27
1
Lancashire
Funster No
42,184
MH
Coach build
Exp
2013
Thanks that’s what I was trying to say but I could not explain what I meant I realised that if I had a weight although I had sufficient payload and also air suspension fitted it would probably put more weight on my backend other than the additional weight that I was adding
Thanks Alan
 

lunarman

LIFE MEMBER
Sep 23, 2008
1,785
1,102
South Glos
Funster No
4,151
MH
C Class
Exp
since 1994
The formula for calculating the additional load on the back axle is:

The weight of the load + the weight of the load X (the length of overhang/the wheelbase)
 
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