480/70/28's are the same height as 420/85/28's.Hi.
Have a John Deere 6920s running on 520/85/38 rear and 480/70/28 fronts. Just about to order a new set but worried that fronts don’t match the back for rolling radius as when on the road and brake it seems to snatch out of 4wd. Only had the tractor 8 months and just assumed it was right as it came off a dealer. Any help would be appreciated.
Thanks Tim
Ok. Thank you very much480/70/28's are the same height as 420/85/28's.
That would be a fairly standard on a a JD 6920, but JD had a lot of tyre options. If you are worried about the tyre combo on your tractor you may find out the inter axle ratio, some of the JD experts might be able to tell you how or a good JD garage.
Thats the right combination .what percentage of grip on either at the moment?
30% rear and about 20% front.Thats the right combination .what percentage of grip on either at the moment?
13.6 x 24 would be a typical match, but an awful lot depends on tractor type and ratios.Just a quick question on tyres sizes... Currently looking at a tractor, rears are 16.9 34's. What tyre for the front would be the best match to them? Thanks:Thumbp2:
13.6 x 24 would be a typical match, but an awful lot depends on tractor type and ratios.
I always wondered how to check ratios... never knew they were on a plate on MFs.View attachment 69773 View attachment 69774 View attachment 69775 Standing behind your MF there are a couple of plates on the right hand side of the cab under the back window, as per the pictures.
In the small silver square in the bottom left corner of the bigger one is a number, the gearbox ratio, it is 1,23 on mine, check that number on yours and get back to me.
I use to remember how to calculate it for JDs, you have to work it out from 3 different figures, JD offers a massive range of tyre options.I always wondered how to check ratios... never knew they were on a plate on MFs.
The 6550 has a 50/50 weight distribution, in my opinion, great for traction but less good when you have a loader on.Hi lads, have a valtra 6550HT currently on 420/70/28 at 25%and 18.4/38 which are wore off her. I have the option of putting either 520/70/38 (35%left) or a 600/65/38 (50%)on her as it was part of the deal. Tractor is doing a good bit of loader and road work but we are also on some wet ground(All grassland). Which would be the better option?
I’m aware I’ll have to change the outer band on the rim at the rear and have got a price for it, would I have to change the front bands if I went to a 480/65/28 down the line? I might try and source a set of rims altogether and keeps current 18.4s on the rims as spares and or duels,would I need different type of rims for duels?
Yes, she’s actually too light in the backend for the loader tbh. The 600’s are vredesteins im unsure as to the make of the 520’s, they are coming off a relatively new JD however.The 6550 has a 50/50 weight distribution, in my opinion, great for traction but less good when you have a loader on.
What brand are the tyres?
In general I would prefer 520's to 600's for grass and road work, and they should fit the same rim as your 18.4's.Yes, she’s actually too light in the backend for the loader tbh. The 600’s are vredesteins im unsure as to the make of the 520’s, they are coming off a relatively new JD however.
Why if you don’t mind me asking?In general I would prefer 520's to 600's for grass and road work, and they should fit the same rim as your 18.4's.
I find the 520's a better match for the weight of tractor, offering a very good balance between flotation and traction.Why if you don’t mind me asking?
Is there a similar plate for new holland or how would a fella go about finding the inter axle ratio? Thanks.View attachment 69773 View attachment 69774 View attachment 69775 Standing behind your MF there are a couple of plates on the right hand side of the cab under the back window, as per the pictures.
In the small silver square in the bottom left corner of the bigger one is a number, the gearbox ratio, it is 1,23 on mine, check that number on yours and get back to me.
I'm sure the info is either stamped on the tractor and or in the user manual, but sorry I don't know where CNH tractors has the info.Is there
Is there a similar plate for new holland or how would a fella go about finding the inter axle ratio? Thanks.
Would the soft ground in mayo make much odds Gone? We don’t have many hills and I probably will add wheel weights. I’d normally just go with the 520’s but I have about 6 acres of big reclaimed and another six to go which will be used for early cut silage so floatation is key there, not drawing any big weights atm other than the cattle trailer and that’s only on the road and possibly a low loader of bales. Would there be much of a difference at all really between a 600 and a 520 on the boggier ground or any disadvantage while drawing loads on the road in terms of ride or stability. Thanks for the input gone, my tyre knowledge is weak to say the least.I find the 520's a better match for the weight of tractor, offering a very good balance between flotation and traction.
I find a tractor of the weight and power of a 6550 doesn't have the weight or power translate it's power into traction on grass while on 600's.
In very soft wet ground with the loader off and a large weight on the back the 600's would have an advantage, but in my opinion not enough to justify the new/altered rims needed. Most of the time it is the front wheels that will let down a 6550 with a loader.Would the soft ground in mayo make much odds Gone? We don’t have many hills and I probably will add wheel weights. I’d normally just go with the 520’s but I have about 6 acres of big reclaimed and another six to go which will be used for early cut silage so floatation is key there, not drawing any big weights atm other than the cattle trailer and that’s only on the road and possibly a low loader of bales. Would there be much of a difference at all really between a 600 and a 520 on the boggier ground or any disadvantage while drawing loads on the road in terms of ride or stability. Thanks for the input gone, my tyre knowledge is weak to say the least.