Chalkley Tires--Michelin XM27's

[glennmac]

Chalkley Tires--Michelin XM27\'s

Mark,

Welcome back.

The Michelins come up in discussions periodically. Actually, I am currently thinking of upgrading to a larger tractor and one of my candidates is a 3710, which offers the same tire sizes as your 4310, so I assume the circumference ratios are the same.

What would be the proper XM27 front and rear sizes be for a 3710? Your attachment posts I think trailed off before you got the Michelins on your front.

Re your comment about lawns, do you have any reason to believe XM27's would be worse than R-4's on a lawn? I would mow lawn with the larger tractor and I wouldnt be concerned about R-4's.

 

[glennmac]

Re: Chalkley Tires--Michelin XM27\'s

Pending Mark's return, I'd like to get any info anyone has on these tires. I seem to recall that at least two people in addition to Mark have them. How do you evaluate their performance? What sizes did you get for which tractors?

 

[JOR_EL]

Re: Chalkley Tires--Michelin XM27\'s

Glenn,

Just wanted to acknowledge your post. I'll get back later with more detail, but I have the Michelins on my JD4700(rear) and some extra wide Titans on the front. Meeting the gear ratio requirements presents very few choices to pick from but I'm pleased with my setup. The lead/lag ratio is different on the Deeres, when compared to the Kabotas, and you will need to know the specific ratio for the tractor model you are going to buy, in order to choose tires correctly. I can tell you(later) what it is for my tractor, and for Mark's, but it is not always easy to get the numbers, as they are not always given in the promo-brochures, and can take some tracking-down, via the service depts of the mfgs. I had special wheels made at a custom-wheel shop for my front (wide) tires, but the standard JD (Titans) will be (just) in the proper range to work with the Michelins, if you choose to use them (on a JD 4500/4600/4700).

The Michelin XM27 front tires will NOT give the proper ratio on these tractors. Be aware that the acceptable range of workable ratios is given differently by different sources (Firestone and JD, for example), so (like the tool situation) nothing is simple here either. /w3tcompact/icons/crazy.gif

Making your tractor-choice is the first step to concrete numbers for your tire-matching!

HTH,

Larry

 

[glennmac]

Re: Chalkley Tires--Michelin XM27\'s

Larry,

I forgot it was you who had them, and I'm sure you did your homework. What size Michelin did you use on the rears? Did it go on the stock JD R4 rim? What did you pay?

 

[MChalkley]

Re: Chalkley Tires--Michelin XM27\'s

Glennmac,

(Thanks!) I would expect the ratio for the 3710 to be the same as the 4310, but I wouldn't bet on it. Actually, I should say "pardon the pun" after that, because you'd be betting the cost of the tires (the front ones, at least) and that's a chunk of change!

The ratio on my L4310 HST is 1.57. With that ratio, the Michelin XM27 19.5LR24 rear tires and 11LR16 front tires are a perfect match.

You'll still need to verify what your ratio is. Is yours HST? I think it's also different between HST and GST, at least on some models.

As for using them on lawns, I don't know if they would be the same as other R4's or not. The advantage would be that they're radials, so more flexible, and also can be aired down more. The disadvantage would be that the cleats are noticeably "sharper" than with other R4's. Great for traction, maybe great for tearing up lawns, too - but I don't think they'd be any worse than "normal" R4's.

MarkC

 

[john_bud]

Re: Chalkley Tires--Michelin XM27\'s

Mark,

By chance do you know the ratio for the L3410's?
Is it just the rolling circumference (RC) of the back divided by the rolling circumferenceof the front tires?


10x16.4 RC = 91.3 inches
420x70 - 24 RC = 136 inches

Ratio = 136/91.3 = 1.49 ??

Thanks,
John Bud

<P ID="edit"><FONT SIZE=-1>Edited by john_bud on 07/13/01 11:37 PM (server time).</FONT></P>

 

[MChalkley]

Re: Chalkley Tires--Michelin XM27\'s

John - No, it's a fixed ratio in the gearing. I had to call Kubota to get it. Generally, you want the rolling circumference of the front tires, when multiplied by the ratio, to be 1-3% greater than the rolling circumference of the rear tires (this is called "lead"). A little more is acceptable, but not the best solution. Anything under 0% (i.e. negative, called "lag") is absolutely, positively unacceptable - and can be very dangerous.

MarkC