Suntour Superbe Derailleur Limit Screws: Thread Spec?

[FL44]

What is the thread spec of a Suntour Superbe (Pro) RD-5200 (5300) derailleur limit screw (5, 6)?

Looking to replace the B-screw (5).

http://www.disraeligears.co.uk/Site/Sun ... an_14.html

 

[Midlife]

Screw 5 engages the dropout to help set the angle of the pantograph iirc. Are you using the mech on a genuine suntour dropout?

 

[FL44]

Re:

The frame features a Campagnolo What is the thread spec of a Suntour Superbe (Pro) RD-5200 (5300) derailleur limit screw (5, 6)?

Looking to replace the B-screw (5).

http://www.disraeligears.co.uk/Site/Sun ... an_14.html
The original B-screw is just a little too short to be effective on that frame. I tried one of the hi-lo limit screws that are the same type just a few mm longer and that one works fine.

So, I was thinking of getting a long enough screw of that type. Should be M4 with a certain fine thread. Just would like to know what type of thread that is to check where I can get this.

 

[darylw357]

Related, my suntour b-screw is bent but I think it's as you say, an M4 fine thread. I've had little luck in finding a replacement so I was going to tap it to M4 coarse.

 

[FL44]

Re:

Would you know the exact type of fine thread?

 

[Midlife]

Strictly the suntour mechanism is not designed for a Campag dropout and it's a bit hit and miss....

 

[darylw357]

Re: Re:

Would you know the exact type of fine thread?

I don't have a thread gauge to measure it with but I was assuming its a fine varient of the standard M4.

Strictly the suntour mechanism is not designed for a Campag dropout and it's a bit hit and miss....

What's the difference between campag and suntour compatible drop outs? I'm sure this bike had this RD from new and it shifts OK.

 

[FL44]

Re: Re:

Would you know the exact type of fine thread?

I don't have a thread gauge to measure it with but I was assuming its a fine varient of the standard M4.

For sure it’s M4. Just would like to know the specific fine thread type…

 

[Nob]

Fine thread pitch is 0.5 which should be marked on a Tap so you can chase the threads in your rear mech..

 

[FL44]

Re:

Along 0.5 there are further metric fine thread types: 0.20, 0.25, 0.35. Also, there are non-metric types.

Sure, if I could get access to fine thread taps then I could find out.