I'd always heard that the real 'issue' with using car antifreeze ("coolant") in a motorcycle was the silicates would destroy the water pump, which is why you want MOTORCYCLE specific antifreeze. Based on that, the PEAK antifreeze you show is listed as being FREE of SILICATE, so it should be okay.
This is an excerpt from Dennis Kirk website that might help:
Choosing the right motorcycle fluids is crucial for your ride to operate properly. Follow this guide to learn about each type of fluid and what's right for you.
www.denniskirk.com
Coolant
For long lasting cooling performance, you should only use motorcycle and powersport specific engine coolant/antifreeze. There are two kinds of coolant; propylene glycol and ethylene glycol. Propylene glycol is often accepted as the best option for motorcycles.
The two types of coolant should never be mixed. If you are unsure of what type of coolant is in your system, make sure that you never mix different colors of coolant together. The different types are dyed separate colors to help users better identify them.
You should also look for coolant that does not contain any silicates or phosphates. Silicates and phosphates in coolant will form a layer over the metals of the coolant system to help insulate it. If left unmaintained, the coolant will break down as the silicates and phosphates create the layer and are removed from the liquid. The layer can also become too thick and not allow enough heat to be transferred from the engine into the coolant, causing the engine to overheat. Another problem with silicates and phosphates is that
they can "eat" water pump seals. The coolant that you use should also be safe to use with aluminum as many motorcycle radiators are made with it.
Motorcycle coolant should be changed fairly regularly. One year is often a good start, but it can be stretched out longer if needed. The coolant should be mixed with ionized water (
DISTILLED WATER) to help prevent scale buildup that can be caused with impure water.
Another plus side of propylene glycol is that it is actually not poisonous if it happens to be ingested. This makes it much more safe to use around pets and children.
