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Friend has a 15 RG with a slight wobble at 70+... he just did a lot of work to the bike so narrowing down to what the issue could be is not so easy. Added a 21" front and 17" rear wheels, Metzeler rubber on both wheels, he also added the lower fairings, extended bags and new rear fender...

Took it to HD in PCB and they adjusted the neck... still wobbles.

Local dealer has suggested lowering the front end and even raking the trees! I think both are unnecessary, especially raking the trees. PM told him the Metzelers like a lot of air and to run 50 in the rear and 45 in the front... he's trying that this afternoon. Someone even said the 21 and 17 wheel raised the bike and is screwing up the aerodynamics underneath the bike... seriously...

He's tried adjusting all the vents while riding and it doesn't help. Odd part, if he takes his feet off the floorboards and stretches his legs out the wobble gets a lot worse!

Does it sound like an aero issue? Could it be the bags and the fender/lower fairing? Anyone with a 15 RG running 21/17 combo have this issue?

Thanks!
 

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Did you ever get this resolved. I'm having the same issue with mine. PM wheels 18 Rear / 21 Front. Wobble kicks in at 65mph. Tire pressure, suspension, wheel balance are all good.
 

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On my old 2012 RG I had the same issue until I lowered the front end, tightened the neck. Problem solved.
 

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Did you ever get this resolved. I'm having the same issue with mine. PM wheels 18 Rear / 21 Front. Wobble kicks in at 65mph. Tire pressure, suspension, wheel balance are all good.

If you recently installed your wheels, you may be able to switch the rear one back out. I had the same problem for about the first twenty miles after I had my 21/18 install. Took the bike back to the dealer, had them swap the 18 rear with a stock sized rear. No more problems!


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Im friend with wobble, just joined. I changed rubber from Metzler to Michelin Commander 2. So far so good with exception of screw in rear tire, which dropped air pressure and bike started weaving again. New tire about to be mounted and hope all is back to normal. I also lowered front 1" with HD Low Profile Premium Ride Single Cartridge Fork kit. Also have front lower fairings and hoping that has nothing to do with problem??? Thanks
 

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I agree with the post about lowering the front end. With the 21" wheel, you changed the rake. I had the same problem on a softail and a touring bike. Lowered with progressive mono tube and fixed it immediately.
 

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I have the same issue. It seems to be an aerodynamics problem when you make subtle changes on the 2015+ road glides. It doesn't seem to help that I'm a smaller guy at 165lbs.

I have a 21/18 wheel combo, legends rear air ride, 4" extended bags and flush side covers by Top Shop Baggers, and Harley's chopped tour pack. It has a nice streamlined look, and rides great under 60mph. But this set up seems to invite a wind generated high speed weave at 65+mph. Tire pressure, bearings, wheel balance, etc all are to spec. The air ride is up to stock height when I ride.

To further rule out wheels / suspension problems, I had the original wheels put back on and kept the extended bags, side covers and tour pack attached. The high speed weave still kicked in at 65+mph with the OEM wheels. This weave is more pronounced on an open multi lane interstate than on back roads.

Decided to take off the extended saddle bags, side covers and tour pack as an additional check and it rides fine, even with the 21/18 set up. Need to find some solutions to keep high speed stability with the extended bags. Until then I need to stay off the highway and keep it under 65. Which totally sucks, because I have a stage 4 on this bike and was planning some long haul trips over the fall.

Considering a True Track stabilizer and mono tube front shocks, but not sure if that will work.
 

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I feel your pain!!! I also notice more on interstate, especially close to high concrete walls with trucks close by. If you install the TT stabilizer please let me know if it makes a difference or any other changes you make and I will do the same. Thanks
 

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I have the same issue. It seems to be an aerodynamics problem when you make subtle changes on the 2015+ road glides. It doesn't seem to help that I'm a smaller guy at 165lbs.

I have a 21/18 wheel combo, legends rear air ride, 4" extended bags and flush side covers by Top Shop Baggers, and Harley's chopped tour pack. It has a nice streamlined look, and rides great under 60mph. But this set up seems to invite a wind generated high speed weave at 65+mph. Tire pressure, bearings, wheel balance, etc all are to spec. The air ride is up to stock height when I ride.

To further rule out wheels / suspension problems, I had the original wheels put back on and kept the extended bags, side covers and tour pack attached. The high speed weave still kicked in at 65+mph with the OEM wheels. This weave is more pronounced on an open multi lane interstate than on back roads.

Decided to take off the extended saddle bags, side covers and tour pack as an additional check and it rides fine, even with the 21/18 set up. Need to find some solutions to keep high speed stability with the extended bags. Until then I need to stay off the highway and keep it under 65. Which totally sucks, because I have a stage 4 on this bike and was planning some long haul trips over the fall.

Considering a True Track stabilizer and mono tube front shocks, but not sure if that will work.
i have the same setup up you have with 21'- 18' with extended bags/CVO rear fender installed. you said you put your stock bags back on and wobble went away? i did install the progressive mono tube lowering kit and it helped alittle but still there. wondering if you found any other fix that will help this situration.
 

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The 21/18 combo is notorious for 65-75 mph wobble, especially with 200 series tires.

If you make this mod without compensation for the different angles on the bike, chances are you're going to wobble. If you go with this combo you should expect to either:

Lower the front end to bring it back within specs

Install a stabilizer bar

It's not just '15s. Mine is a 13 and had the same problem. I opted to go with a stock sized rear wheel/tire, which fixed the problem immediately.

The 21/17 combo isn't as bad, but it can get loose too. IMO, I just say wait the extra few weeks for a stock sized rear. Good luck with whatever you decide.


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UPDATE:

After speaking to Drew at HogPro I followed his suggestion to switch the rear tire to the Harley Dunlop touring tire for an 18" rear wheel. It's H-D part# 44006-09 (D407 180-55-18). After the install 95% (my estimate) of the high speed weave has gone away. I confidently ride at 75-80mph on the interstate again. Per Drew the combination of a thicker side wall and higher load rating of the Harley Dunlop D407 vs the Avon Cobras that were on my 18" rear helps stabilize the bike at higher speeds.

I have not changed the front tire. I still have the Avon 120-70-21 (68 load rating) on the front. It has a higher load rating than the stock 19inch Harley tire.

This solution was contrary to what H-D was telling me about the extended bags and side covers causing the stability problem from cross winds. I have not lowered the bike, nor added any other stability track devices. (still debating lowering it an inch). The primary issue with the stability was the tires. I feel that this is particularly so given that my wet weight on my Road Glide is about 30+ lbs heavier than stock with all the aftermarket accessories added (including the larger wheels).

Hope this helps. I give much thanks to Drew at Hogpro for his help even though I didn't order my tire/wheels from them. If I had to do this over they would be my first choice as they seem to know more than what H-D service people seem to know about touring bike suspensions.

Good luck. Ride safe.
 

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I was just wondering if everybody else got there problem solved with there extended bags? I've got a 2015 Road glide with a 21 inch wheel on the front and was planning on putting on top shop extended bags and fender.
 

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As I told the original poster on the phone earlier, on the 2014 and newer baggers we recommend the Dunlop 44006-09 180-55-18 tire on the rear. For some reason the rear with a Metzeler or Avon has a tendency to get a wobble at high speed. Not everyone gets it but some people do. I have also used the Pirelli Night Dragon tires with success. Run your PSi at the max listed PSI on the tire as well.

Front run Harley part nubmer 43100008 Dunlop (130/60/21)
Rear run Harley 44006-09 Dunlop 180/55/18

Drew
 

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I have extended bags as well. Speaking from my experience: I have a 21" front and matching 16" (stock size) rear, and extended bags. When I had the 18", 200 series rear, it wobbles like crazy! I was advised that the problem was the rear wheel size/combo. I ordered a stock sized rear, problem 100% solved! Rides better than stock. I didn't lower the front at all. I also have a stage IV Kit, and it rides true well above 100mph.


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I did not mention the 200 tire part of the equation and forgot to ask if that is what tire is on there as if it is has always been known to be an issue. 180/55/18 on the rear of a bagger. 200 will fit width wise but will cause a high speed wobble.

Drew
 

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Thanks guys, I have the stock size wheel on the rear. I'm going to pull the trigger on the bags and fender and give it a try.
 

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Oh man! I just threw up a little in my mouth reading this thread.

I had a 2013 that I put a 21/18 front/rear setup on with a 200 rear (metzlers front and rear) and extended bags. Loved it and it road great at all speeds.

I JUST got my 21/18 w/ 200 rear (and metzlers on both) after three months of waiting for the wheels to be made and finished the build - this time including the 110 tire shredder kit so you know it pains to have wobble at speed. When I jumped on the highway I had this wobble happening between speeds of 75-90 and seemed more pronounced as it decelerated around 80. It didn't seem to happen on the two lane road when I punched it up to 90 to test, but 90 in a 55 isn't a convo I wanted to have with the po-po so it wasn't sustained.

I'm gunna be sick if I have to start guessing with different tires and maybe have to order a new rear wheel setup.

I'll try to pull the extended bags to see if that fixes. If not, I'll put the stock rear wheel/tire back on to see if that does it.

Did I read right that someone fixed by lowering the front? Should I get an HD front lower kit or put air ride in front to be able to adjust it?

It's comforting to see that I'm not the only one having this issue, and that I didn't mess something up on the install, but man I can't believe that the same setup I ran on my 2013 RG wont work on my new and improved 2015 Rushmore RG.

I might crawl up in the garage and cry a little now :crying:
 
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Good looking bike BlueJob. My 15 stock is steady and planted and zero issues. I appreciate the info and after reading this thread I don't foresee changing tires or wheel sizes from stock. Who needs the headache.
 
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