I am thinking of buying Schwalbe "Marathon Winter Plus" or "Winter" tires with spikes. I intend to use them on a touring bike which when loaded will have:

1. about 25kg (55 pounds) of luggage (2x5kg on the back rack and 2x5kg on the front, 3kg on the handle bar and 2kg for odds and ends).
2. Myself 77kg (170 pounds)
3. The bike itself, a Surly Troll around 18 kg (39 pounds)

I normally inflate both tires to 3bar (43 PSI).

**Questions**

1. Will this load cause the spikes to puncture the tubes?
2. What is the likelihood of the spikes puncturing the tubes?