650/75r38 questions

What’s the opinions on this tyre size? Better going for 650/65r42s? I’m Wanting to run 600/65r28s on the front so thought they would be the correct match.
Are BKT in the 75 profile a good option or best avoid? Do the 75 profile 650s fit on a rim I’ve got for 650/65r38? Or would I need a wider/custom rim for them?
Thanks.
 

Chae1

Member
Location
Aberdeenshire
Personally I would go for the 42s.

Ive got 75/38s on my tractor at moment. The 42s will give you more clearance and be cheaper to replace.

I bought 710/75 profile bkts as replacements for original trelleborgs. They were fine.
 

Michael S

Member
Arable Farmer
Location
Matching Green
A 650/75R38 will carry more weight at the same pressure than a 650/65R42 of the same make and type, just check the manufacturers load inflation charts. Personally I'd always pick 650/75R38s over 650/65R42s for field work. I have Trelleborg 650/75R38s on my Valtra T174 which are rated to carry 3940kg at 1bar at 40km/hr, the Trelleborg 650/65R42 is rated to carry 3540kg at 1 bar at 40km/hr.

Follow the link and click on "pressure table" under any of the tyres families and you will see a pdf of all the Trelleborg tyres. I am sure you can do the same with most manufacturers. https://www.trelleborg.com/en-gb/wh...try-tyres-/tractor-tyres/agricultural-tractor
 
Thanks for the replys. The 650/42's are certainly a cheaper replacement, but most of the tractors work will be cultivation, slurry, fert and some silage work in the summer. So swaying more towards the 650/75s.
What size of rim does the 650/75s fit? Can they go on the same rim as a 650/65/38? Or does it need a larger, heavier rim?
Thanks
 

Boysground

Member
Mixed Farmer
Location
Wiltshire
I changed tractor and went from 650/42 to 650/38 entirely subjective but i am sure the tractor does not sink as much when I am on cultivated ground. The 2 tractors were the same weight

Bg
 

Michael S

Member
Arable Farmer
Location
Matching Green
Thanks for the replys. The 650/42's are certainly a cheaper replacement, but most of the tractors work will be cultivation, slurry, fert and some silage work in the summer. So swaying more towards the 650/75s.
What size of rim does the 650/75s fit? Can they go on the same rim as a 650/65/38? Or does it need a larger, heavier rim?
Thanks

Trelleborg says DW23Bx38 for 650/75R38 and DW20Bx42 for 650/65R42. However some IF versions, I know certainly some Bridgestone sizes, come in NRO versions which is narrow rim option so it may be worth checking tyre manufacturer websites or your local tyre suppliers if they are switched on enough. When we needed to replace the Xeobibs (that we hated) on our 820 we happened upon a set of 650/75R38s with the matching fronts all on rims that were new take-offs at Brock Wheel and Tyre (BWT). They are pretty knowledgeable and would probably be able to supply what you need.
 

tr250

Member
Location
Northants
As previous said. 650 75 38 will carry the same weight at lower pressure. which will also increase traction. Have a look at Mitas SFT tyres.
I’ve got mitas sft on the combine although they are 800/75r32. I’m not that impressed they seem to be very round at the shoulder leaving more of a rounded rut and I don’t feel I can let them down anymore to carry the weight.
 

snipe

Member
Location
west yorkshire
I’ve got mitas sft on the combine although they are 800/75r32. I’m not that impressed they seem to be very round at the shoulder leaving more of a rounded rut and I don’t feel I can let them down anymore to carry the weight.
Do they have CHO on the side wall? What combine are they on?
 

snipe

Member
Location
west yorkshire
I don’t know about CHO what does it mean. There on a Lexion 650
CHO is cyclic harvest operations. If the tyres came with the combine from new I would expect that they are. just had a look at combine spec sheets and your machine is only a 100kg lighter than ours. We had Mitas weigh ours to set the pressures. We can run them down at 15psi if needed but we usually have them at 20 as we have some hills to go across. They do look a bit rounded at the top, but look very flat and long at the bottom. Make me cringe sometimes if you get out and look at them with a full tank, but got the thumbs up from Mitas.
 

tr250

Member
Location
Northants
CHO is cyclic harvest operations. If the tyres came with the combine from new I would expect that they are. just had a look at combine spec sheets and your machine is only a 100kg lighter than ours. We had Mitas weigh ours to set the pressures. We can run them down at 15psi if needed but we usually have them at 20 as we have some hills to go across. They do look a bit rounded at the top, but look very flat and long at the bottom. Make me cringe sometimes if you get out and look at them with a full tank, but got the thumbs up from Mitas.
I’ve got mine at 18psi perhaps it’s that they have a higher sidewall than my old 800/65r32 continentals but I don’t feel they leave as wide flat print on the ground
 

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