BMW G310 R/GS Forum - View Single Post - Metzeler Tourance Tyre pressure G310GS
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post #10 of (permalink) Old 11-14-2017, 11:43 PM Thread Starter
R1deS1uT's Avatar
Join Date: Nov 2017
Location: Mid North Coast, NSW, Australia
Posts: 55
I took my GS back to the dealer today to get the first 1000k service and to get them to look at the 4000rev idle problem. Of course the bike decided it was going to idle normally after 2 days of mucking up. The long and the short of it was they needed me to leave the bike with them til about friday and gave me their demo 310GS to ride in the meantime. The demo had 350ks so it was interesting to compare. It felt tighter and higher than mine, and felt quite hard and a bit twitchy on the Hwy home. Got home and let the tyres cool down and then checked them. As I expected, they had way too much air pressure in the tyres, 38-45psi. let air out to 34-38psi and will take it out later to test it.

Here is an interesting experiment from a Visordown tyre thread;
Start with the bike manufacturer's recommendation in the owners manual or underseat sticker. This is the number they consider to be the best balance between handling and tire wear. Further, if you're running alloy wheels on poor pavement, consider adding 2 psi to the recommended tire pressure just to reduce the likelihood of pothole damage. Check your tire pressure regularly.In order to get optimum handling a tire has to get to its optimum temperature which is different for each brand of tire. Most of us don't have the equipment needed to measure tire temperature directly so we measure it indirectly by checking tire pressure since tire pressure increases with tire temperature. Tire temperature is important to know because too much flexing of an underinflated tire for a given riding style and road will result in overheating resulting in less than optimum grip. Overpressurizing a tire will prevent the tire from getting up to the optimum operating temperature and performance again suffers.A technique for those wanting to get the most out of their tires on the street is to use the 10/20% rule. First check the tire pressure when the tire is cold. Then take a ride on your favorite twisty piece of road. Then, measure the tire pressure immediately after stopping. If the pressure has risen less than 10% on the front or 20% on the rear, the rider should remove air from the tire. So for example, starting at a front tire pressure of 32.5 psi should bring you up to 36 psi hot. Once you obtain this pressure increase for a given rider, bike, tire, road and road temperature combination, check the tire pressure again while cold and record it for future reference.Each manufacturer is different. Each tire model is different. A tire design that runs cooler needs to run a lower pressure (2-3 psi front) to get up to optimum temperature. The rear tire runs hotter than the front tire, road and track. So the rear tire cold-to-hot increase is greater.Dropping air pressure has the additional side effect of scrubbing more area.For the track you'll have to drop the cold tire pressure an additional 10/20%.

Last edited by R1deS1uT; 11-15-2017 at 12:11 AM.
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