Hi, this is a bit more complicated than most people think !
R1250GS operates with the autolevel system, so it reads the live data from the swing arm sensors .
If you decide to slap hyperpro (Touratech rebranded parts TT doesn't make suspension ) springs, you will destroy autolevel mode ,the best thing BMW ever made for suspension.
I have contacted Hyperpro about this product, and they are not able to provide any dat with the spring. What they suggest one spring fits all riders regardless if they are 70KG or 140 KG
It doesn't make sense!
The best way to get this done is to lower the suspension exactly the same way as the manufacturer does by installing stroke limiting spacers and using stiffer shorter springs. Then calibrate DESA and autolevel will work properly . Zero out the sensors at full extensions so the system knows exactly what the SAG is .
Side stand and centre stand need to be altered if you drop more than 25 mm
On some occasions, side stand works, but the bike is a bit more vertical. What goes with it is easy to lift the side stand .
Another fact about Hyperpro lowering spring.
I have a spring rater that can messure the spring force in full travel very precisely ,this allows me to get all the data and compare to what they normally are with OEM spring or aftermarket setups like Tractive .
Tractive also offers good solution short shock, but the budget must be 2K+
(Nice upgrade that will also fix no damping in the ROAD setting)
Hyperpro uses dual rate spring or progressive spring, but the biggest problem I found is initial spring rate that is half of what it should be to achieve correct sag so the bike blows through the stroke and static sag is usually 25mm more then is should be . And then the rider sag will be like 100MM out of 200mm available.
Second part of the stroke is usually way to soft plus the bike is so low in the stroke that bump rubber on the rear is constantly engaged and this can creates hashness and very unpredictable behaviour when hitting biger objects.
In this situation, if the bike is in the auto level mode, the system will apply full preload just to try getting preprogrameed SAG settings.
But yes, it does what it says on the box it will drop the bike 25mm
So from the budget perspective, this is a good option, from a performance perspective. It is the worst thing you can do to your bike, but the choice is always yours .
You could achieve the same results by installing OEM springs with zero initial preload, then it cost zero and in reality will have the same result as Hyperpro lowering spring . But I don't recommend it.
All the best Luke
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