I just recently bought a B7100 HST tractor. Tires are very old and definitely need replaced. I know there are a lot of threads already that discuss tires for these older b7100 like tractors, but they always end up getting uber confusing because a bunch of people chime in with different variations and I keep getting lost. So, I’m making a thread specific to the B7100 HST to try to keep things clear.
Just so we’re all on the same page, here’s the tractor data wheel dimensions: https://www.tractordata.com/farm-tractors/005/1/4/5147-kubota-b7100hst-dimensions.html
I’ve got AG tires on it currently, and I want to keep the same style. But, here’s where things get confusing:
1) Tractor data calls for 8.3-16 rears. The tires on there are 8-16. I know that the RC is what really matters, but this tire is so old I can’t find the RC for it (Bridgestone k8702). Additionally, the tractor obviously was not super well maintained, so I don’t trust that the previous owner actually checked to make sure they could use these particular 8-16 instead of the recommended 8.3-16. So, does anyone know what the RC for these should be or how I might find out? Tractordata is wrong. Official size in the WSM is 8-16.
2) I don’t see anything on the valve stem to secure it to the rim. This makes me believe that these are tubeless. Is this a correct assumption? Outside of taking the wheel off, is there any way to be 100% certain? Assuming I want to just go with adding a tube, will I need new rims? Or can I just get a tube for the new tires? Tires are indeed tubeless. This is determined by a fat rubber based stem as opposed to a skinny straight stem or a stem with a bolt to secure it. There are no issues with converting tubeless to tubed.
I know this is a lot so, if I need to clarify anything please let me know.
Edit:
Adding answers to my questions in red for posterity incase anyone else comes looking.
Just so we’re all on the same page, here’s the tractor data wheel dimensions: https://www.tractordata.com/farm-tractors/005/1/4/5147-kubota-b7100hst-dimensions.html
I’ve got AG tires on it currently, and I want to keep the same style. But, here’s where things get confusing:
1) Tractor data calls for 8.3-16 rears. The tires on there are 8-16. I know that the RC is what really matters, but this tire is so old I can’t find the RC for it (Bridgestone k8702). Additionally, the tractor obviously was not super well maintained, so I don’t trust that the previous owner actually checked to make sure they could use these particular 8-16 instead of the recommended 8.3-16. So, does anyone know what the RC for these should be or how I might find out? Tractordata is wrong. Official size in the WSM is 8-16.
2) I don’t see anything on the valve stem to secure it to the rim. This makes me believe that these are tubeless. Is this a correct assumption? Outside of taking the wheel off, is there any way to be 100% certain? Assuming I want to just go with adding a tube, will I need new rims? Or can I just get a tube for the new tires? Tires are indeed tubeless. This is determined by a fat rubber based stem as opposed to a skinny straight stem or a stem with a bolt to secure it. There are no issues with converting tubeless to tubed.
I know this is a lot so, if I need to clarify anything please let me know.
Edit:
Adding answers to my questions in red for posterity incase anyone else comes looking.
Last edited: