Recommendations? 90 degree valve stems for 1300?

Why not go with T-valves?
One Schrader valve sticks straight up,
but the other comes off at a 90 degree angle.
They're made of metal, nickel plated.
I just bought these ($20 each) from WingStuff.com. They arrived in a week and were stored, awaiting the next tire change on my ST,
which now will happen.... NEVER. Never for that particular machine, anyway.
 
If you have the type of TPMS that is integrated inside the wheel on the valve stem then you shouldn't replace the stems. Also I would not recommend to attach a 90 adapter but at most use an adapter that you put on only when checking PSI.
My AK 550 has this type of TPMS... on the valve stem inside the wheel.

If you have a "normal" stem (no TPMS on the inside part) then absolutely replace with a 90 deg stem at the next tire change. Amazon or many other places like local mc stores will have them for all price levels. They are all about the same quality IMO.
If you want or have an add-on TPMS then definitely use a T-stem as mentioned above. The TPMS would go on the straight up end and you check PSI on the side end.
 
T stems are just too ugly for me to use, I’m sorry. I’ve used 90 degree aluminum valve stems with external TPMS sensors for better part of 20 years and paid $30 a set for some stems and $10 set for others. I found no difference in functionality.
 
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