do these need a paved surface to function properly or would grass be OK?
2029457
This works both on my concrete patio and on the grass. We had moved it onto the flat grass several times for parties and never had any issues.
641171
I have always had the wheels on the sidewalk. I suppose you could put them on the grassy side but would be not as smooth of a surface.
1492681
I suspect that the large rear wheels will last several years with normal usage on a paved surface. The wheel wear will vary based on the load(weight) carried by the product. The front wheels appear to be more fragile and may not last as long as the rear wheels under these conditions. That said, this product works very well and is worth the price.
569126
I'm not sure why they wouldn't be? I wouldn't use them on pavement though, as it tends to wear out the wheels and make them rough.
360274
We had 2 acres of land and it was fine. It is a little slow the thicker the grass is though. It definitely does better on pavement. You may want to look for something else if you are wanting something more powerful. Good luck!
699416
I don't have any issues as long as the grass isn't wet which will make the rear wheels slip. Be careful of a rollover if the slope gets too steep.
162387
The wheels are more than stable enough for hooking up to the back of a bicycle for riding, so I would think that they would be stable enough for running on smooth surfaces.
197358
We used them on gravel and never had a problem with them. Never had to use them on grass.
2101213
I would think so, but I don't ride gravel roads and not sure what loosely paved would be. I ride mainly blacktop and concrete road. I have rode on gravel and it did fine, but that is very little gravel.
1953565
I think they are surprisingly fast on pavement. They also perform well in gravel and on fire trails. Mud I doubt, and cornering in wet pavement is not great. Grass is no problem, and sticks no problem i would think. They are versatile in my opinion, but its not a mountain bike tire nor a road tire, its in the middle ground, good at many things but not great at 1. Hope that helps.
1116065
To some extent yes. It is reasonably controlable on smooth surfaces but the small wheels are not that well suited to say a paved surface. Again, it requires also that one use one's feet and legs to propell it, unlike a wheel chair with the large wheels which can be operated by hand.
585589
I would think it would do ok. We bought it knowing some of our walking paths are not paved. The tires are not "off-road" but for mostly dirt I would think they would hold up for occasional off road trips.
924421
You know we've only really used them indoors on tile, wood, and carpet. They did fine in all of those situations. I'm sure they'd be great on a sidewalk or level patio or driveway. I think it would work on short level grass, too, but we haven't tried. Hope this helps! Great rainy day save down a hallway!
877586
They perform well. The wheels may wear down fast and unevenly with outside use though.
257882
I think it would best for hard surfaces. The tires are small and when we did take them on a trail, we lifted them over obstacles. Gravel roads should be fine as long as they are not to loose.
619921
In my experience the tires are very durable, but they're also essentially slicks with no real gripping power. If the gravel is loose, traction on turns and hills could be a problem. Packed gravel or dirt should be fine... mud would be a problem, though.
1194465
I would only set it up on grass, or like a floor would be fine, I wouldn't recommend setting it up on tar or gravel. Unless you could find some type of mat/protection for the bottom..