Nail through inner tube - Repair or Replace?
 

I was planning on patching the inner tube but was wondering how the patches would hold up to 100mph+ heat and pressure.

Also, where do you get car patches from or do I just use big bike patches?

I am guessing new tubes aren't that expensive but so far Google only finds off-road inner tubes

New tube always best.

Thought so. Thanks!

Maybe I'm very cautious, but I'd not drive any car with inner tubes at 100mph - even more so with tyres that aren't designed to have inner tubes (ETA I don't know what tyres you have in that respect)

Inner tubes are dirt cheap so I'd always go with a new one after a puncture. I carry a couple of spares so any tyre fitter can get me going again if I have a flat.

As for sourcing them in the right size, speak to King's Lynn Tyres -

http://www.kingslynntyres.co.uk/

They have all sizes in stock as they're the go-to place for stock-car competitors who race at the Saddlebow track (and run with tubes fitted because they help keep the tyre on the wheel in shunts). I needed one replacing after a puncture and it was about £7.50 for one the right size for a 175/80/14 tyre.

As for driving at 100mph+ on tubed tyres, unless you're on run-flats you're in trouble if a tyre blows out at those speeds, tube or no tube. :(

An interesting aside to this.

I had new tyres on my International Stepside but decided, against advice, to put inner tubes in 'to be on the safe side'. The day after the Brass Monkey run 2014, I came out to see one totally flat. I took the wheel off but couldn't see anything in it to cause the puncture. The tyre fitter discovered that a sticky label on the inside of the tyre had rubbed against the tube until it leaked.