From the picture and the description it seems as I have exactly similar wheels on my old launching trolley for my wayfarer. However the bore diameter is 35mm and there are trolley wheel bushes in black plastic reducing the bore diameter to 29mm. Don't you have wheels with a bore diameter of 35mm? (As mentioned everything is the same on my wheels 4.80/4.00-8 and 2.50A-8, so doesn't really understand why they do not come with 35 mm bore?)

Hi not sure what brand of trolley you have but if it is one of ours it will be a heavy duty trolley and you will need this wheel https://www.tridentuk.com/gb/pneumatic-trolley-wheel-extra-wide-16-x-6-inch.html If it is not our trolley we have these options: The opti-flex puncture proof trolley wheel https://www.tridentuk.com/gb/opti-flex-lite-puncture-proof-solid-trolley-wheel-370mm-diameter-539836.html Pneumatic Trolley Wheel Extra Wide 16" x 6" - the wheel is the same size as the standard trolley wheels however the tyre is wider and you will need to check that it does not obstruct your trolley. https://www.tridentuk.com/gb/pneumatic-trolley-wheel-extra-wide-16-x-6-inch.html Hope this helps