These tires will fit on your 850. They should also be okay for load capacity. They are only fraction smaller than the 195/60R15 original tire, so your speedometer will only be about 1% off. However, be aware that these tires will certainly handle much differently than the original "V" speed rated tires. I'm not sure what kind of tires you have on the car now, but "T" rated tires are usually less stiff in the sidewalls and will give you a softer ride at the expense of handling. I actually run "T" speed tires on my 850 because they conpensate, somewhat, for the extremely stiff suspension that is on these cars. As long as you are not a super aggressive driver and don't exceed 100 mph on the highways for extended periods of time they should work okay. Why is he selling them so cheap?