38 and 42 inch rears

nick...

Member
Arable Farmer
Location
south norfolk
what are the benefits of bigger over smaller tyres.are the 42s a lower aspect ratio to remain the same circumference as the 38s.is traction better on either or is the weight carrying capacity and ride better on one over the other.seems several 150hp tractorsare available with either size.just wondering,thanks
Nick...
 
I would think rim size is a byproduct of tyre size choice, a larger circumference will give a longer footprint but air volume also affects ground pressure/tyre pressure so for example a 800/65r32 has a similar rolling radius to a 650/65r38 or a 20.8r38, the more air volume the lower pressure the tyre can be ran at .
Don’t think I’m explaining this too well so will give up now.:(
 

cvx175

Member
Location
cumbria
Bigger rims look better, bigger tyres are better for the soil and carry more weight at a given pressure. Given the choice between 650/65r42 and 650/75r38 take the 42s if you care about looks and the 38s if you care about your soil.
42s are better if you're doing a lot of road work not just about the look of them
 

kill

Member
Livestock Farmer
Location
South West
Bigger rims look better, bigger tyres are better for the soil and carry more weight at a given pressure. Given the choice between 650/65r42 and 650/75r38 take the 42s if you care about looks and the 38s if you care about your soil.
But the 42's will also be alot cheaper to replace.
 

ColinV6

Member
When we bought our T7, we looked at one with 28’s and 38’s and 540/650’s and it looked half the tractor of the one on 30’s and 42’s.

Maybe a bit vain, and I’m sure there are other benefits, but even Dad agreed and was asking if the one on 28/38’s was a smaller model tractor :ROFLMAO:
 

HarryB97

Member
Mixed Farmer
Only worth having a 42 inch rim if it has a big tyre on it like a 710/70 or 710/75 otherwise you dont have enough air volume in it to run it at low enough pressures. Amazes me the amount of new tractors that people spec on tyres like 650/65/42 or 710/60/42 bad ride, look terrible and generally run at a higher pressure
 
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Run 650/75/38 & 600/65/28 on a Puma CVX 165. Took advise from Redpath tires when purchasing the tractor and they sent the Michelin rep out to weigh the tractor with all bits of kit we use on it which provided me with all the info I need when doing thecsaid operation. Happy so far with the choice.
 

Speedstar

Member
Location
Scottish Borders
Only worth having a 42 inch rim if it has a big tyre on it like a 710/70 or 710/75 otherwise you dont have enough air volume in it to run it at low enough pressures. Amazes me the amount of new tractors that people spec on tyres like 650/65/42 or 710/60/42 bad ride, look terrible and generally run at a higher pressure
We have a set of 710-60-42 have done over 8000 hours now and never had more than 14psi in them , ride is great on the road even as low as 8psi in them. Only thing with tyres that size do not put them on a tractor bigger than 200 hp as they are not rated for that hp
 

cvx175

Member
Location
cumbria
We have a set of 710-60-42 have done over 8000 hours now and never had more than 14psi in them , ride is great on the road even as low as 8psi in them. Only thing with tyres that size do not put them on a tractor bigger than 200 hp as they are not rated for that hp
Really? trelleborg rate them for up to 300hp
 

Boysground

Member
Mixed Farmer
Location
Wiltshire
I swapped my drill tractor this autumn. Gone from 650x42 to 650x38. Tractor is near enough the same weight as the old one and it is noticeable (light chalk soils) that there is less mark from the new tractor.
A few years ago I went on a vaderstad drill training thing. I remember the guy there saying how often people forget to get the right front tyre and that they had data to suggest the front tyre often caused more compaction than the rear. I have gone from 540 to 600 on the front.

Most importantly I like the look of a big tyre on a 38 inch rim:)

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