Author Topic: Roll Design Bumpsteer Issue (Read 8107 times)

hontrx265r · « **Reply #15 on:** October 11, 2015, 10:03:13 PM »

You have the inners mounted under the flag?

hontrx265r · « **Reply #16 on:** October 11, 2015, 10:05:11 PM »

400 ex spindles rod end goes under, on stem flag it goes on top.

Allison#51 · « **Reply #17 on:** October 11, 2015, 11:28:04 PM »

Quote from: hontrx265r;59741

400 ex spindles rod end goes under, on stem flag it goes on top.

Yeah they're on there right. I don't think they would fit the wrong way.

Allison#51 · « **Reply #18 on:** October 11, 2015, 11:41:34 PM »

If someone could measure their +3's uppers the way I did so I can compare that would be sweet!

dem3500 · « **Reply #19 on:** October 13, 2015, 08:16:16 AM »

Quote from: Allison#51;59724

Upper is roughly 12" from center of the front bolt to the end

Lower is roughly 16" from center of the bolt too the edge of the spherical bearing cup. And the tie rods are pretty close to equal lengths.

In the above pic are the heims set for 0deg camber? If so then there's plenty of meat to bring it in to a negative camber. Are you trying to bring the top of the tire in or out?

Tbone07 · « **Reply #20 on:** October 13, 2015, 09:17:55 AM »

Quote from: Allison#51;59745

If someone could measure their +3's uppers the way I did so I can compare that would be sweet!

I'll measure mine when I get home after work. I have similar issues with Roll front end setup

Allison#51 · « **Reply #21 on:** October 13, 2015, 01:31:38 PM »

Quote from: dem3500;59819

In the above pic are the heims set for 0deg camber? If so then there's plenty of meat to bring it in to a negative camber. Are you trying to bring the top of the tire in or out?

Yes with the heims set there it's at 0' camber at 7 1/2" ride height. I had negative camber in it before. By backing it out to 0' I was able to improve the Bumpsteer slightly.

Allison#51 · « **Reply #22 on:** October 13, 2015, 01:34:50 PM »

Quote from: Tbone07;59822

I'll measure mine when I get home after work. I have similar issues with Roll front end setup

Awesome thanks! I'm trying to get this figured out before my race this weekend. I know it'll be better then what it was before. I about got thrown off in the whoops last race. Something still seems off though.

dem3500 · « **Reply #23 on:** October 13, 2015, 01:59:12 PM »

I guess it's just a trade off between bump steer and handling. Just a suggestion, get a stabilizer and pull in your camper to -3 to -6. You shod habe acceptable bump steer and really good handling

mx250r91 · « **Reply #24 on:** October 13, 2015, 06:05:06 PM »

I got roughly the same measurements on a set of +3 Roll Lobo II arms

Quote from: Allison#51;59724

Upper is roughly 12" from center of the front bolt to the end

Lower is roughly 16" from center of the bolt too the edge of the spherical bearing cup. And the tie rods are pretty close to equal lengths.

Allison#51 · « **Reply #25 on:** October 13, 2015, 10:38:44 PM »

Okay thanks! That's reassuring. Still confused why other sets are different. I tightened everything back up tonight on it and I'm still not real happy with it but it should be better. It gets really weird when I try to string align it! like the axle is shifted way to the right. Part of it is that lonestar didn't machine the splines far enough on the right side of the axle. I had to cut a shorter spacer to make the cotter pin hole line up. Drives me crazy.

sgb318 · « **Reply #26 on:** November 04, 2015, 12:02:30 PM »

If your using a string from rear to front and it seems off it may be your Frame. Stand it up on the grab bar and use a 6' level to see if the center of the swingarm at the axle housing is in line with the center of frame at the pegs and the steering stem. If your running mx you should be setting your camber .5-1.5 degrees, I've never heard of setting it at 0 but I've not heard everything.

Thanks!
Steve

Allison#51 · « **Reply #27 on:** November 04, 2015, 06:45:10 PM »

Quote from: sgb318;60752

If your using a string from rear to front and it seems off it may be your Frame. Stand it up on the grab bar and use a 6' level to see if the center of the swingarm at the axle housing is in line with the center of frame at the pegs and the steering stem. If your running mx you should be setting your camber .5-1.5 degrees, I've never heard of setting it at 0 but I've not heard everything.

Thanks!
Steve

Yeah that's a good idea I'll do that. I was kinda thinking about pulling the rear tires off too and running a straight edge off the rear hub to the front and measuring in to the frame on each side. I will probably put some camber back in it for next MX season but I'm currently setting up for ice racing and it's gonna be different on each side.