16 inch wheeled bike for 4 year old

Any recommendations? Third bike after 12" and balance bike. They don't last long do they? Hence the £150 budget.
They all seem to be 8kg to 12kg although I did spot one at 6kg for a tenner more. If you can suggest a decent spec bike weighing 6kg for less that would be perfect.
They all seem to be 8kg to 12kg although I did spot one at 6kg for a tenner more. If you can suggest a decent spec bike weighing 6kg for less that would be perfect.
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7005-T6 frame, cromoly forks with guard eyelets, ahead stem, v brakes with adjustable levers, sealed BB, 6kg weight, etc. Is that the islabike or the cheaper one I've seen?
The question is whether to take a chance on this 6kg bike that he'll grow into or not? I remember getting new bikes and they were always a bit big for me. He's growing out of his 12" and I think he won't get enough time out of a 14" bike. Bikes are too expensive to last just 1 year. At £160 the cosmos is a new bike at Islabikes second-hand prices or less and it's a decent bike.
We are planning on using it with a follow-me tandem thing which attaches to the axle and the kid's bike is towed along. One idea is to tour this way for our summer holiday. So any views on whether to get this bike that's perhaps a bit big would be appreciated. BTW we're not keen on the hassle of buying a second-hand bike and then selling it to get the money back. We want a new bike then after he's grown out of it we'll work out what to do. Probably sell via local noticeboard.
The other issue is the bike looks like it's a bit long for him. Looking at other 16" bikes this one seems to be bigger overall. Slightly higher than a hoy bonaly and longer. He'll be on tippy toes and leaning a lot further forward.
Hmmm! It's not so clear cut I reckon. I don't want to get a 14" because he'll outgrow it within 6 months to a year.
We put our son on his 16" Bonaly at around 3, The seat was slammed to the bottom but he could just about fit and managed fine.
He does cycle speedway and all the kids there are on the biggest bike they can reach the floor on (some stand on a block of wood at the start!), so he was in the same boat as the others.
That reminds me I have to lift his seat a bit, not even 4 yet and he is 110cm!
I think we need to visit a bigger Halfords store because the one we went to was too cluttered to test ride. Plus there was one spanner monkey busy and nobody else to assist. There's a bigger store nearby so we'll take him next weekend. He'll be able to ride in a straight line without anything in the way there plus they have slightly more shop staff and at least one knows his stuff.
Good news is our followme tandem will help with getting to safe places for him to ride. One issue with his bigger bike. We can't fit our bikes and his inside the car to get somewhere to ride. Our bike rack is knackered so we're considering buying roof top bike racks for our bikes and his in the car. Anyone got recommendations for cheap but good racks? Is the £29.99 halfords roof bike rack any good? The old paddy hobkirk roof bars they once sold had a reputation for flying off the car on the motorway. I'd hate for that to happen with the Halfords bike racks if they're rubbish.
How do you carry a 16" kids bike? On top of the car? Inside the car? Boot based rack?