Sub. Mach. Bar Backs and ZTechnik Z6150 Acc. Mount - - Excellence in Motion
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old Aug 19th, 2009, 3:50 am Thread Starter
Join Date: Jul 2007
Location: Anaheim, CA, USA
Posts: 1,397
Sub. Mach. Bar Backs and ZTechnik Z6150 Acc. Mount

Just before a very long ride, I installed ZTechnik Z6150 Accessory Mount and the Suburban Machinery BB3 Bar Backs on my 2007 BMW K1200GT. I use the mount for a Garmin Zumo 660 GPS.

Suburban Machinery makes a different bar back (BB4) for the K1300GT. There are other brands of handlebar extenders as well (Helibar and Verholen). It is unclear whether my results would apply to them.


I had problems with the original installation, just before the long ride. It was obvious that I needed longer screws to fit my Suburban Machinery bar backs. Inside the ZTechnik package, there was a note, saying that users with bar backs should call a toll free number. It was the holiday weekend, and there wasn't time to call and get replacement screws, so I purchased screws from a local supplier (Hillco Fasteners, They had stainless steel M8 x 45 mm screws, and non-stainless M8 x 50mm screws. They were out of the M8 x 50 mm stainless screws that day.

The aluminum spacers (sleeves / wide washers) would not fit over the 45 mm stainless screws from Hillco, because the "neck" of the screw was too wide. I couldn't test them. The aluminum spacers were a very tight fit over the non-stainless 50mm screws, and I used them for the long ride. When I returned, the screws had already started to rust, and it was challenging to remove the spacers without marring them.

After the ride, I called ZTechnik, and they sent me pairs of M8x50 and M8x55 stainless screws. I told them that I would test them and report back.

The M8 x 55 (55 mm) screws are too long. They bottom-out before the mount is tight. The M8 x 50 (50 mm) screws make a tight fit on my K1200GT. The mount and handlebars feel secure. I worry that they may be close to bottoming out, but they were good for me. In my opinion, M8 x 45 mm screws should also work. I have not tested them.

* M8x50 mm stainless screws worked well with my setup.

* M8x55 mm stainless screws are definitely too long.

* M8x45 mm stainless screws may be better, but were untested.

* Some brands of M8 screws (stainless and and non-stainless) have a "neck" that is too wide for the aluminum spacers (sleeves) that come with the ZTechnik mount. The screws supplied by ZTechnik did not have that problem.

* There are two other brands of handlebar extenders for the K1200GT (Helibar and Verholen). They were untested.

* The Suburban Machinery BB4 bar back for the K1300GT was also untested.

Last edited by XMagnaRider; Aug 19th, 2009 at 4:10 am.
XMagnaRider is offline  
Sponsored Links
post #2 of 2 (permalink) Old Aug 19th, 2009, 4:07 am Thread Starter
Join Date: Jul 2007
Location: Anaheim, CA, USA
Posts: 1,397
Additional Notes about Suburban Machinery Bar Backs

I called Suburban Machinery to get an email address, so I could share the above information with them. The owners (Terry and Sally) were both very nice on the phone. I had an interesting discussion with Terry. Note: I bought my Suburban Machinery bar backs (model BB3 for a K1200GT) used. They didn't come with instructions or a description sheet.

Terry was surprised that I had bought the ZTechnik mount. He asked me why I didn't use the 6mm holes on the bar backs instead. He explained that he had designed the bar backs so that owners could create their own accessory mounts using a metal plate, drilled to match the GPS cradle and anchored to the bar backs using the 6mm holes on top of the bar backs. This was a revelation to me, so I thought I would share it with the group.

I told him that I had been told that the holes were designed for a RAM ball mount, and I liked the positioning and adjustability of the ZTechnik mount. (I didn't tell him that I leave the bar backs off much of the time. I prefer the stock handlebar positions, and use the bar backs only for very long rides, so I needed an alternate GPS mount anyway.)

Terry told me that the 6mm holes do not match RAM ball mounts, which are 1/4-20. He told me that you can easily drill and tap the holes to 1/4-20 to fit RAM balls. He said that he may change from 6mm to 1/4-20 holes on the BB3 and BB4 bar backs some time in the future.
XMagnaRider is offline  

Quick Reply

Register Now

In order to be able to post messages on the - Excellence in Motion forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
ZTechnik large windscreen with bar backs? Mike_Millsap K1200RS/GT (Classic) 6 May 20th, 2006 11:59 am

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome