Originally Posted by
porschejim911
Your 1st link is the stock tire, Trx P/n 4970, its 3.2" ID, 5.75" OD, and 3.5" wide. This came on the older 3906 model with the black chassis.
The 2nd link is the stock tire on the new Emaxx 3905 with the gray chassis - its a bigger tire - 3.8" ID, 6" OD and 3.5" Wide. It won't properly fit the 3906 wheels.
Your 3rd link - no it won't fit either wheel, its made for much narrower wheels.
Go to TRX, dn load the parts listing for what you have and look on Tower - it will give you specs for he stock tire. Then find another tire with those specs and you're good.