Suntour/Shimano top mount shifter boss adapter

User avatar
familyguy
Posts: 5773
Joined: Wed Apr 16, 2008 2:30 pm
Location: Cremorne, NSW

Suntour/Shimano top mount shifter boss adapter

Postby familyguy » Tue Jun 12, 2018 3:04 pm

So, I bought a McLachlan. It has a Suntour top mount shifter boss rather than a boss each side of the DT. This means I can't use the plentiful cable stops for DT bosses for STI/Ergo cable runs. Short of designing and 3D printing an alternative, is there a readily available unit or device (which my Google-Fu has let me down as far as sourcing something goes) that will do the job?

This is the lever boss location:
Image

Jim

User avatar
10speedsemiracer
Posts: 1022
Joined: Sat Feb 11, 2017 7:38 pm
Location: Melbourne, Eastern Suburbs, near the hills,

Re: Suntour/Shimano top mount shifter boss adapter

Postby 10speedsemiracer » Tue Jun 12, 2018 3:22 pm

Is made for the SunTour Symmetric shifter, which came in the downtube-brazed boss mount (such as your example) and a clamp on :

Image

Image

I have seen something similar by Shimano in the same era, think it was in the Touring line, however don't know whether the thread is the same.

The shifters (friction) are floating around on eBay via a couple of different European sellers.
Mmm, SunTour

User avatar
familyguy
Posts: 5773
Joined: Wed Apr 16, 2008 2:30 pm
Location: Cremorne, NSW

Re: Suntour/Shimano top mount shifter boss adapter

Postby familyguy » Tue Jun 12, 2018 3:36 pm

I do have a set of those (I think, or something similar, someplace in my parts boxes). I need a method of cable stop/adjustment to run 10s Ergo. Would usually use these on the side-bossed DT:
Image

I may end up machining one yet.

Jim

User avatar
10speedsemiracer
Posts: 1022
Joined: Sat Feb 11, 2017 7:38 pm
Location: Melbourne, Eastern Suburbs, near the hills,

Re: Suntour/Shimano top mount shifter boss adapter

Postby 10speedsemiracer » Tue Jun 12, 2018 3:40 pm

Origin8 make a clamp on for dt shifter mount. Maybe use one of those and somehow remove the top-mount or repurpose it...clip in pump mount ? (I dunno, just hypothesizing)...
Mmm, SunTour

User avatar
familyguy
Posts: 5773
Joined: Wed Apr 16, 2008 2:30 pm
Location: Cremorne, NSW

Re: Suntour/Shimano top mount shifter boss adapter

Postby familyguy » Tue Jun 12, 2018 3:46 pm

3D printed metal? Now that'd be nice... 8)

Jim

User avatar
10speedsemiracer
Posts: 1022
Joined: Sat Feb 11, 2017 7:38 pm
Location: Melbourne, Eastern Suburbs, near the hills,

Re: Suntour/Shimano top mount shifter boss adapter

Postby 10speedsemiracer » Tue Jun 12, 2018 4:00 pm

This is the shifter boss adaptor I was thinking of :

Image

Some LBS stock Origin8 or can grab it off the eBay.
Mmm, SunTour

User avatar
Thoglette
Posts: 4038
Joined: Thu Feb 19, 2009 1:01 pm

Re: Suntour/Shimano top mount shifter boss adapter

Postby Thoglette » Tue Jun 12, 2018 4:02 pm

familyguy wrote: Short of designing and 3D printing an alternative, is there a readily available unit or device

Hmm, Shimano had something similar. See this Ricardo Elite (c. 1983). I've probably still got one at home.
Image

Or look on ebay
Image
Stop handing them the stick! - Dave Moulton
"People are worthy of respect, ideas are not." Peter Ellerton, UQ

User avatar
familyguy
Posts: 5773
Joined: Wed Apr 16, 2008 2:30 pm
Location: Cremorne, NSW

Re: Suntour/Shimano top mount shifter boss adapter

Postby familyguy » Tue Jun 12, 2018 4:28 pm

The question is...how to adapt the Suntour or Shimano unit to become simply a cable stop. I won't be running levers.

10speedsemiracer wrote:This is the shifter boss adaptor I was thinking of :


Yep, jut saw those. Rather inelegant, though would work for a while until I machined something up. I won't be pulling fittings off the frame, rather not go to that extent and have to repaint it.

Jim

User avatar
Thoglette
Posts: 4038
Joined: Thu Feb 19, 2009 1:01 pm

Re: Suntour/Shimano top mount shifter boss adapter

Postby Thoglette » Tue Jun 12, 2018 4:37 pm

familyguy wrote:The question is...how to adapt the Suntour or Shimano unit to become simply a cable stop. I won't be running levers.


I'd be finding a length of alloy and cutting a groove across it to mount on the frame boss (bolt hole also needed) & then drill/tap holes for adjustable cable stops at either end. A prototype in wood might be a good idea...
Stop handing them the stick! - Dave Moulton
"People are worthy of respect, ideas are not." Peter Ellerton, UQ

User avatar
Clydesdale Scot
Posts: 1992
Joined: Tue Mar 03, 2009 12:55 pm
Location: Adelaide, SA

Re: Suntour/Shimano top mount shifter boss adapter

Postby Clydesdale Scot » Tue Jun 12, 2018 5:29 pm

familyguy wrote:3D printed metal? Now that'd be nice... 8)

Jim

Go
https://www.shapeways.com/materials/steel and the data sheet

LG
Posts: 1658
Joined: Sat Nov 08, 2008 10:46 am
Location: Southeast Tasmania

Re: Suntour/Shimano top mount shifter boss adapter

Postby LG » Tue Jun 12, 2018 5:31 pm

Temporary fix could be an old set of chrome shimano or suntour double cable stops, just clamped in front of the current boss. Like these, should be lots around on old bikes https://harriscyclery.net/product/shima ... e-2458.htm
LG = Low Gear

User avatar
find_bruce
Moderator
Moderator
Posts: 7702
Joined: Mon May 09, 2011 8:42 pm
Location: Sydney

Re: Suntour/Shimano top mount shifter boss adapter

Postby find_bruce » Tue Jun 12, 2018 6:09 pm

familyguy wrote:The question is...how to adapt the Suntour or Shimano unit to become simply a cable stop. I won't be running levers.

10speedsemiracer wrote:This is the shifter boss adaptor I was thinking of :


Yep, jut saw those. Rather inelegant, though would work for a while until I machined something up. I won't be pulling fittings off the frame, rather not go to that extent and have to repaint it.

Jim

It is possible, but you will need to butcher the mount to get this
Image
an account of the butchery here

What you want is this
Image
which I understand is left behind by rocking horses

User avatar
familyguy
Posts: 5773
Joined: Wed Apr 16, 2008 2:30 pm
Location: Cremorne, NSW

Re: Suntour/Shimano top mount shifter boss adapter

Postby familyguy » Tue Jun 12, 2018 6:10 pm

Yep, that's my understanding as well...

User avatar
gm6046
Posts: 12
Joined: Sat Feb 07, 2015 6:34 pm
Location: Melbourne

Re: Suntour/Shimano top mount shifter boss adapter

Postby gm6046 » Thu Jun 14, 2018 10:35 pm

I'm going to do a run of new rocking horse poo replacement ones shortly. CNC machined. Just waiting to get some dimensions from someone who is measuring one up.

User avatar
familyguy
Posts: 5773
Joined: Wed Apr 16, 2008 2:30 pm
Location: Cremorne, NSW

Re: Suntour/Shimano top mount shifter boss adapter

Postby familyguy » Fri Jun 15, 2018 8:50 am

Ooh. I'll send you my email address.

User avatar
find_bruce
Moderator
Moderator
Posts: 7702
Joined: Mon May 09, 2011 8:42 pm
Location: Sydney

Re: Suntour/Shimano top mount shifter boss adapter

Postby find_bruce » Fri Jun 15, 2018 2:52 pm

gm6046 wrote:I'm going to do a run of new rocking horse poo replacement ones shortly. CNC machined. Just waiting to get some dimensions from someone who is measuring one up.

Are you copying the design for top mount round tubes (like Jim's) or aero tubes ?

User avatar
10speedsemiracer
Posts: 1022
Joined: Sat Feb 11, 2017 7:38 pm
Location: Melbourne, Eastern Suburbs, near the hills,

Re: Suntour/Shimano top mount shifter boss adapter

Postby 10speedsemiracer » Fri Jun 15, 2018 3:02 pm

find_bruce wrote:
familyguy wrote:The question is...how to adapt the Suntour or Shimano unit to become simply a cable stop. I won't be running levers.

10speedsemiracer wrote:This is the shifter boss adaptor I was thinking of :


Yep, jut saw those. Rather inelegant, though would work for a while until I machined something up. I won't be pulling fittings off the frame, rather not go to that extent and have to repaint it.

Jim

It is possible, but you will need to butcher the mount to get this
Image
an account of the butchery here

What you want is this
Image
which I understand is left behind by rocking horses


Looking at the top example, I'm not sure that would result in the ideal cable route, but the lower example is properly clever and would keep everything running and even looking almost OE. That is very cool.
Mmm, SunTour

User avatar
gm6046
Posts: 12
Joined: Sat Feb 07, 2015 6:34 pm
Location: Melbourne

Re: Suntour/Shimano top mount shifter boss adapter

Postby gm6046 » Fri Jun 15, 2018 5:23 pm

find_bruce wrote:
gm6046 wrote:I'm going to do a run of new rocking horse poo replacement ones shortly. CNC machined. Just waiting to get some dimensions from someone who is measuring one up.

Are you copying the design for top mount round tubes (like Jim's) or aero tubes ?


It will be for the Aero tubes, but it wouldn't be hard to machine up something for round tubes if there was interest.

Cheers

User avatar
find_bruce
Moderator
Moderator
Posts: 7702
Joined: Mon May 09, 2011 8:42 pm
Location: Sydney

Re: Suntour/Shimano top mount shifter boss adapter

Postby find_bruce » Fri Jun 15, 2018 9:55 pm

gm6046 wrote:It will be for the Aero tubes, but it wouldn't be hard to machine up something for round tubes if there was interest.

Cheers
I will stick my hand up for an aero version. I don't need it for my frame, but if I ever do, its now or spend years searching

User avatar
familyguy
Posts: 5773
Joined: Wed Apr 16, 2008 2:30 pm
Location: Cremorne, NSW

Re: Suntour/Shimano top mount shifter boss adapter

Postby familyguy » Sun Jun 17, 2018 9:50 am

Would be interested in the round tube version, as above. Which aero tubes are you getting thrm done for? Are they all somewhat similar?

Jim

User avatar
gm6046
Posts: 12
Joined: Sat Feb 07, 2015 6:34 pm
Location: Melbourne

Re: Suntour/Shimano top mount shifter boss adapter

Postby gm6046 » Wed Jun 20, 2018 4:04 pm

familyguy wrote:Would be interested in the round tube version, as above. Which aero tubes are you getting thrm done for? Are they all somewhat similar?


I'm not sure if all the Aero tubes are the same or are close enough to interchange. I'll post up some pics and dimensions shortly. Either way, I'm happy to machine them up to match specific tubes profiles if someone has an oddball size.

Who is online

Users browsing this forum: No registered users