Kettle valley trail is used by cars
We rode part of the trail last summer outside Naramata and it was NOT a great experience. The reason: the trail is shared by cars, often four-wheel drive vehicles or pick-up trucks, and they dig up large size gravel that is too big for bikes. Even though we had relatively large tires it was a very uncomfortable ride, requiring constant attention to the road bed, and a lot of body-jarring vibrations over millions of large rocks. I would not recommend it. OR: be VERY VERY sure to find sections of the route that are completely off limits to vehicular traffic. I must say: it was a huge surprise to learn (and not before we were on our bikes and on the trail) that this was a shared-use trail and that a fair number of motorized vehicles used it. We saw about as many motorcycles, trucks and cars as bikes while on the trail. A very big disappointment. It should be mentioned in all the guide books that Kettle Valley is NOT JUST a bike trail. It's used by cars and trucks. Get big tires, and mountain bikes with good shocks, or be sure to find out which parts are truly car-free.