The bronze, silver, and platinum wheels have been messed up since the maintenance last night. (I haven't checked the gold and hematite wheels.) Now they give a level 90 ring as the top available reward for all three, rather than a set piece. This is a GIANT step down from the previous available rewards!
The bronze wheel used to give a piece of Mathew's gear, which while low level had nice benefits if you got a 3, 4, or 6-set. Silver used to give a piece of Ida's gear, and Platinum used to give a piece of Warlord's gear.
Now, I can see someone who's gotten VERY lucky and has a lot of Matt's gear saying a level 90 ring is equivalent... though it's still iffy. I mean, You can get level 90 gear from wilds and they're cheap to trade, unlike set gear, which is expensive no matter the level. However, it is absolutely impossible to say that a level 90 ring is better than a piece of warlord's gear as a reward.
I don't understand why you made these wheels even less desirable then before. At least if you got REALLY lucky before you could get something good from them. Now you have zero chance of anything decent. The best you can hope for is a building scroll. Was this the intended effect?