Join Date: May 2006
Location: Chicago, Illinois, USA
Model: 1997 GL1500 2007 GL1800
Well it's been almost a year now since I went darkside on the rear and later double darkside by the end of last year. I wasn't able to get a lot of riding in since then because of recovering from minor surgery at the beginning of this year. I had been running 44-46 PSI in my Formoza and after putting the BT45 on the front, it was recommended that I go at least 44 PSI there as well. Now I have been able to get a bunch more riding in. I had originally started with 40 psi in the rear and would get wobbles at higher speeds in corners (75 mph+). At 42 psi, it seemed to help but was still there, At 44 psi, it was considerably better. But the one thing that kept coming up was a strange oscillation while riding straight ahead. It would show up after riding straight forsome length of time. It wasn't anything that would make me concerned about losing control, it just felt weird. I even tried bumping the Formoza up to 48 and the BT45 to 46 but it would still keep showing up. So I decided to try and go the other way with the tire pressure. I ended up dropping the front BT45 down to 34 psi and the Formoza rear to 36 psi. At first I was concerned that I might have difficulties. I thought that the front end might be hard to maneuver and had previously been warned that higher pressure was needed to help prevent a "squirrely" feel. However for me, it seems like the opposite occurred. The front end is still just as easy to maneuver but also has a nice solid feel. With dropping the rear pressure, I was initially concerned that I might get the wobbling in corners but at a lower speed. That also didn't seem to happen. At 80-85 mph+ in corners, I will still get a slight wobble if the pavement is uneven but under that it seems to feel perfect. The one thing that does seem to have gone away though is the straight ahead oscillation.
The thing that concerned me about those higher pressures was that the Formoza lists a max pressure of 44 psi and the BT45 lists a max of 41 psi. I am not a fan of running a tire at or over the max psi. but that was what many darksiders were recommending. On cars, it seems like the recommended operating pressure is normallybetween 20-30% below the max psi. In my case, it seems like running at a lower psi might be the ticket. I still have to get some more miles on these tires to make sure.
How many other darksiders have tried experimenting with lower pressures instead of running at or over the max psi? If so, what experiences have you had?
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Honorary Wild Rhino- Thanks Fly!!
07 GL1800 - Crucible Orange Metallic
Converted to California Sidecar Viper Trike.