[HondaRyan420]

hey guys new here and alot of info. can't find the exact answer I'm looking for so i figured I'd ask. I have a 2016 honda rancher 420 SRA dct and have a big gun full exhaust and power box currently I'm running 26 s/w buzz saw xc tires, love the tires but wanting to go bigger to get the ground clearance a little higher at the rear axle. it currently has a HL lift kit on it so clearance isn't an issue. my question is how big can I go with out a gear reduction. have been looking at 28s but considered 30 mudlite xxl bc I can get a set at a good price. thanks for the info and love the forum

 

[misterclean59]

I have owned three 420's. My complaint is that 1st gear was so low it was unusable. Therefore I'd guess that even the 30's would be ok unless you do some serious mud bogging or serious rock crawling.

 

[Jeepwm69]

I didn't know they made a DCT with SRA. Interesting.

Looks like the secondary is the 37/25 tooth setup, so they're geared high from the factory. I wouldn't go over 26's with that secondary in there.

If you swap in a secondary from a footshift which is 40/22 you'll have about a 20% gear reduction and the new gears are about $50 new from Honda.

https://www.partzilla.com/catalog/honda/atv/2016/trx420fm2-2ac/final-shaft

You will likely have to shave down your rear speed sensor a little bit, and your auto shifting may or may not work properly afterwards. If it doesn't, Rapid Revolutions makes a module that you can splice in that will restore factory shift points. The module is about $160.

The above reduction and module is what I did on my wife's 420DCT. Even so I've only got light 26's on it. I've thought about going to a light 27", but 28's I'd be worried about, and 30's there's just no way.

If you had a footshift I'd say light 28's maximum. Your DCT is geared high from the factory, so I wouldn't go any bigger that what you have without doing a gear reduction.

30's? Wouldn't even try it without a substantial gear reduction, which will mean having someone make one, and probably $400+ and you may or may not completely lose your auto shifting

 

[alloutdoors]

I think you have some great advice from jeepwm69, and I would further agree/emphasize intended use of the rancher; that is, if parade riding, showing with little to no mud bogging, you have some flexibility in tire size. However, if you are wanting to mud bog, etc., with the size tires desired you will likely run out of HP before hurting the machine, but you will be putting serious stress, etc., on the clutch, driveline, etc., so you could chasing problems downstream....

 

[Jeepwm69]

The wife's DCT in auto mode seems to run in a higher gear than I normally would run. With that in mind, if you put monster tires in it, you can forget about riding in auto mode. It will run in too high of a gear, lug the motor, and burn your clutches up in short order.

 

[SamUK]

Jeep said it all in the above post.
To run 30’s or bigger you’ll need a foot shift motor and 69% reduction. Also a swing arm and shaft extension I’d have thought.

26’s is usually the biggest for a bone stock Honda.

 

[mac102004]

DCT 26" max without gear reduction.

 

[HondaRyan420]

thanks for the replys and advice guys. the 26s on there now weigh in st 112 pounds combined wieght 26 fronts and 30 rears. they aren't the lightest of tires and the machine turns them better with the mods I have then it did completely stock with the stock tires. also I would definitely agree that auto mode is always on to high of a gear. I always run it in es that way I'm in control of shifts. I thought maybe going to a bigger lighter tire wouldn't be a problem bc the mud lites in a 28x10x12 weigh in at 26.8 lbs and the 28x10x12 zillas weigh 26 lbs according to factory specs is the reason I ask. I know the shear size will be harder to get rolling but thought maybe it could possibly handle a 28" tire coming in at a total wieght of 104lbs vs 26s at 112lbs . I don't do a hole lot of mud riding mainly just trails and creek beds with occasional mud hole was just trying to get enough clearance to quit from getting hung and banging the rear axle on rocks and tree stumps. thanks for all the awesome info.

 

[HondaRyan420]

oh and here's a pic of mine. love this little thing.

 

[redtherocket]

30's are out of the question..

I run 25" as a compromise...lol

Had 26", they throw off anything over 2nd...

 

[misterclean59]

I didn't know they made a DCT with SRA. Interesting.

Looks like the secondary is the 37/25 tooth setup, so they're geared high from the factory. I wouldn't go over 26's with that secondary in there.

If you swap in a secondary from a footshift which is 40/22 you'll have about a 20% gear reduction and the new gears are about $50 new from Honda.

https://www.partzilla.com/catalog/honda/atv/2016/trx420fm2-2ac/final-shaft

You will likely have to shave down your rear speed sensor a little bit, and your auto shifting may or may not work properly afterwards. If it doesn't, Rapid Revolutions makes a module that you can splice in that will restore factory shift points. The module is about $160.

The above reduction and module is what I did on my wife's 420DCT. Even so I've only got light 26's on it. I've thought about going to a light 27", but 28's I'd be worried about, and 30's there's just no way.

If you had a footshift I'd say light 28's maximum. Your DCT is geared high from the factory, so I wouldn't go any bigger that what you have without doing a gear reduction.

30's? Wouldn't even try it without a substantial gear reduction, which will mean having someone make one, and probably $400+ and you may or may not completely lose your auto shifting

Thanks Jeep, I didn't know the DCT was a taller gear. So yes it makes sense about the overall final drive ratio.

 

[HondaRyan420]

I didn't know they made a DCT with SRA. Interesting.

Looks like the secondary is the 37/25 tooth setup, so they're geared high from the factory. I wouldn't go over 26's with that secondary in there.

If you swap in a secondary from a footshift which is 40/22 you'll have about a 20% gear reduction and the new gears are about $50 new from Honda.

https://www.partzilla.com/catalog/honda/atv/2016/trx420fm2-2ac/final-shaft

You will likely have to shave down your rear speed sensor a little bit, and your auto shifting may or may not work properly afterwards. If it doesn't, Rapid Revolutions makes a module that you can splice in that will restore factory shift points. The module is about $160.

The above reduction and module is what I did on my wife's 420DCT. Even so I've only got light 26's on it. I've thought about going to a light 27", but 28's I'd be worried about, and 30's there's just no way.

If you had a footshift I'd say light 28's maximum. Your DCT is geared high from the factory, so I wouldn't go any bigger that what you have without doing a gear reduction.

30's? Wouldn't even try it without a substantial gear reduction, which will mean having someone make one, and probably $400+ and you may or may not completely lose your auto shifting

Thanks Jeep, I didn't know the DCT was a taller gear. So yes it makes sense about the overall final drive ratio.

yes jeep thanks for all the great info. being as it is a higher gear ratio makes since on ho2 it acted going from the stock 24s to the 26s when stock. will definitely be looking into a secondary swap

 

[Jeepwm69]

I put a 500 Foreman top end on the wife's when I rebuilt the motor and added a programmer.

A pipe on a 420 is useless. The factory muffler is the same as a 2012-2013 Foreman muffler so it's breathes plenty good for a 420 motor.

Unless you do a gear reduction, you will not turn bigger tires effectively.

I see the same "can I run 35's on my Jeep with 2.73 gears?" questions all the time on Jeep boards too.

You can. Your rig will be a dog, but you can do it.

If you want to have any capability at all you either run smaller tires that match your gears, or you regear. That is the ONLY proper way to do it. Any other way you do it you're fooling yourself.

You're talking about going lighter, which is a must regardless of what you do, but if you buy 28's that DCT is going to be an absolute DOG unless you do a gear reduction.