[UPDATE:]

When you look for one for the ZForces or others with small 30mm bore size the cost can be 30+ USD is some cases. I found several that I thought I would try while having my front axle out and finding the bearings needed lube. The first one was for a Can Am but was spaced and sized right for my Z so I ordered it. It did take over a month to arrive from China but it worked just fine. It does require the axles to be out of the bearing though..but its only 13 USD. This is it:
https://www.amazon.com/Maverick-293350040-Commander-Defender-Outlander/dp/B09K7FVJYW?pd_rd_w=4YWWz&content-id=amzn1.sym.80bfd2e5-c81d-48d5-ae85-c500e2214af9&pf_rd_p=80bfd2e5-c81d-48d5-ae85-c500e2214af9&pf_rd_r=F2SZPKBM4A9F13GMW8K6&pd_rd_wg=i4ebF&pd_rd_r=adcc9dbf-738c-413e-80d5-7b672dd87121&psc=1&ref_=pd_bap_d_csi_pd_ys_c_rfy_rp_crs_0_t

The next one, unlike the one above, is one that can be used with the axle still in on some machines, but you will have to remove the nut, hub and push the axle in as far as you can. I have not received this one yet but will be there in a day or so and will test it on the other side. Where the one above is 29mm this one is 29.96mm and may have a problem fitting without adjustment so let me test it first. It's only 15 USD This is it:
https://www.ebay.com/itm/403718973725
.
UPDATE: The second one came and will not work with the axle intact. You will still have to remove the knuckles to grease your bearings and either one of these will work but...after doing the other side with the second one I have to say I like the RED first one better because I like to take it slow and rotate the bearing after every little pump or two so as to push out all the old grease, pack the new in evenly and not warp the dust seals any more then necessary. The second one touches the cir-clip holding the bearing in a little at the knurling where the other doesn't. But it did work OK.     

Thank you for answering my post this board is the greatest.
NMK when you find out about the rear please let me know.
Also to let you,,,,i have a 2006 brute force that i would like
to pick your brain about in the future.Since it's off subject from
cf moto can i still post my questions on the cf moto board?

[2015 Z Force 800 53/Trail EPS]

Thank you for answering my post this board is the greatest.
NMK when you find out about the rear please let me know.
Also to let you,,,,i have a 2006 brute force that i would like
to pick your brain about in the future.Since it's off subject from
cf moto can i still post my questions on the cf moto board?

Of course...ask away

Will the bearing grease tool you used fit both front and back
axels? I was looking at a video on u tube and greasing the bearings look cut n dry
once you get it apart.It all looks simple.
How often should i grease them?

[2015 Z Force 800 53/Trail EPS]

Will the bearing grease tool you used fit both front and back
axels? I was looking at a video on u tube and greasing the bearings look cut n dry
once you get it apart.It all looks simple.
How often should i grease them?

It should fit both...if both are 30mm. I need to do my rears and will post when I do. As for how often that will depend on your riding conditions but I can say mine were almost bone-dry with no noticeable wear at 2000 dry, dusty miles. Keep in mind CFM uses the minimal amount of lube in everything though. Those that ride in much water will want to do it way more often and in all cases I recommend using a quality marine wheel bearing grease as water has a harder time mixing with it. The only tip I will add in doing this is...go slow..little pumps at a time and keep rotating the bearing as you do so not only will you push the old dirty lube out, but not push out or permanently warp the dust covers while doing so.