More trailer / towing stuff....

   Tyre pressures.

I have 3 trailers. Two standard combis on 8" wheels and a double stacker on 10"

One set of the 8" tyres says 'Max 90psi' , one set says 'Max 65psi' with the 10s saying 60psi.

Now I'm a bit too scared to pump them up to that.....surely they'd either pop or float away :-)

Just got me thinking whilst following a 'what tyre pressure?' convo on a faffbook page.

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fleaberto Send Private Message Find Member's Posts Far too distracted from work Joined: 12 Jan 09 Location: United Kingdom Online Status: Offline Posts: 302	Post Options Post Reply Quote fleaberto Report Post Quote Reply Topic: More trailer / towing stuff.... Posted: 18 Mar 16 at 5:00pm
	Tyre pressures. I have 3 trailers. Two standard combis on 8" wheels and a double stacker on 10" One set of the 8" tyres says 'Max 90psi' , one set says 'Max 65psi' with the 10s saying 60psi. Now I'm a bit too scared to pump them up to that.....surely they'd either pop or float away :-) Just got me thinking whilst following a 'what tyre pressure?' convo on a faffbook page.
	Lightning368 'All the Gear' (409), Lightning368 'Sprite' (101), Laser (big number) 'Yellow Jack', RS Vareo (432)'The Golden Rays'

JimC Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6649	Post Options Post Reply Quote JimC Report Post Quote Reply Posted: 18 Mar 16 at 5:11pm
	Well maximum is maximum safe limit, not recommended operating pressure...

Steve411 Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 09 Sep 08 Location: Cheddar, Somerset, England Online Status: Offline Posts: 705	Post Options Post Reply Quote Steve411 Report Post Quote Reply Posted: 18 Mar 16 at 5:16pm
	I just put 35psi on my normal combi tyres. I think the max was 60. No science involved - just looked about right. They looked a bit soft with 20psi which was what is was before I pumped them up.
	Steve B RS300 411 RS300 page

423zero Send Private Message Find Member's Posts Really should get out more Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3406	Post Options Post Reply Quote 423zero Report Post Quote Reply Posted: 18 Mar 16 at 7:08pm
	I also use 35 psi, any harder and trailer bounces all over the place. I have a dedicated Fireball trailer, a small luggage trailer, all om 8" tyres and a double stacker on 10".

Rupert Send Private Message Find Member's Posts Really should get out more Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956	Post Options Post Reply Quote Rupert Report Post Quote Reply Posted: 18 Mar 16 at 8:04pm
	I use about 20. The suspension units on trailers are generally too hard for a boat, and a soft tyre allows for some give. Never had trouble with this in tens of thousands of miles towing over the years. Have been overtaken by the wheel, but that was for a different reason - student SC trailers.
	Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686

Do Different Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 26 Jan 12 Location: North Online Status: Offline Posts: 1312	Post Options Post Reply Quote Do Different Report Post Quote Reply Posted: 20 Mar 16 at 8:02am
	Pretty much as everyone above says. One thing to remember, as pressure mostly dictates the amount of flex in the carcass it can quite closely relate to heat generated. Go too low and heat build up can be a factor in tyres failing especially on long trips when running at high speed. I imagine that crossply tyres are more prone to this as they generally have stiffer sidewalls which would generate more heat through the internal friction of flexing than radials. Obviously for our trailers we use traditional high section tyres, not the low profiles you see on lots of cars now sometimes on commercial car transporters and such like.

Paramedic Send Private Message Find Member's Posts Really should get out more Joined: 27 Jan 06 Location: United Kingdom Online Status: Offline Posts: 929	Post Options Post Reply Quote Paramedic Report Post Quote Reply Posted: 20 Mar 16 at 8:06am
	to add to that finding good quality tyres is a challenge especially in the smaller 8 inch diameter. Even some 10 inch tyres (145 B 10) are only rated to 50mph.