Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Suntour AR FD

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Suntour AR FD

Old 02-12-12, 04:08 PM
  #1  
Senior Member
Thread Starter
 
r0ckh0und's Avatar
 
Join Date: Jun 2009
Location: Plano, IL.
Posts: 1,618
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 135 Post(s)
Liked 196 Times in 97 Posts
Suntour AR FD

Suntour AR FD Range

I asked about this over in C&V but did'nt get any response, so....

I'm finishing up an overhaul on my Sekai 2500 Grandtour and am having an issue engaging the big ring with the FD. Bike appears to be stock with an add on triple and the Suntour AR is designed for a double. It will engage when the chain is on the outer half of the freewheel but it does'nt seem to be to happy about transfering over.

I'm thinking a shorter BB spindle might solve the problem as it looks like there is plenty of clearance between the small ring and the chain stay (about 6mm). Otherwise, what would be a suitable replacement, something that matches up well aesthetically with the Suntour ARX RD? Or, any other suggestions are welcome.
__________________
Be where your feet are.......Lisa Bluder

r0ckh0und is offline  
Old 02-12-12, 04:18 PM
  #2  
Senior Member
 
bikeman715's Avatar
 
Join Date: Mar 2008
Location: Salinas , Ca.
Posts: 2,646

Bikes: Bike Nashbar AL-1 ,Raligh M50 , Schwinn Traveler , and others

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 85 Post(s)
Liked 2 Times in 2 Posts
5 - 6 mm clearance is normal between the chainrings and the chainstay . you wouldn't want it closer then the derailer may not drop the chain onto the smallest . there are limits in the derailer both ways. and it normal to use the first three cogs on the rear with the big one in the front ,that way you don't get crosscogging . same go for middle to middles and the smallest with the low gears . try adjusting the high (h) strew on the derailer and see if that help .
bikeman715 is offline  
Old 02-12-12, 04:23 PM
  #3  
Senior Member
Thread Starter
 
r0ckh0und's Avatar
 
Join Date: Jun 2009
Location: Plano, IL.
Posts: 1,618
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 135 Post(s)
Liked 196 Times in 97 Posts
Yes, I have the limit screw maxed out.
__________________
Be where your feet are.......Lisa Bluder

r0ckh0und is offline  
Old 02-12-12, 04:35 PM
  #4  
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 13,758

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 1748 Post(s)
Liked 1,186 Times in 825 Posts
IF you have an adjustable cup type BB, you MIGHT find swapping the spindle will change the CL.
Some spindles are symmetrical & some aren't. OTOH, you might already have the "short end" on the drive side?
Bill Kapaun is offline  
Old 02-12-12, 04:45 PM
  #5  
Senior Member
Thread Starter
 
r0ckh0und's Avatar
 
Join Date: Jun 2009
Location: Plano, IL.
Posts: 1,618
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 135 Post(s)
Liked 196 Times in 97 Posts
I'm usually pretty careful with that and I did double check. Non symmetric and the long end is on the drive side. I could try flipping and see what the difference would be. I think 2mm less would be plenty and still leave me enough range on the granny side.
__________________
Be where your feet are.......Lisa Bluder

r0ckh0und is offline  
Old 02-12-12, 05:01 PM
  #6  
Senior Member
 
bikeman715's Avatar
 
Join Date: Mar 2008
Location: Salinas , Ca.
Posts: 2,646

Bikes: Bike Nashbar AL-1 ,Raligh M50 , Schwinn Traveler , and others

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 85 Post(s)
Liked 2 Times in 2 Posts
flipping the axle might work ,only way to tell is to try .
bikeman715 is offline  
Old 02-12-12, 05:53 PM
  #7  
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 6 Times in 5 Posts
Otherwise, what would be a suitable replacement, something that matches up well aesthetically with the Suntour ARX RD? Or, any other suggestions are welcome.
Suntour Mountech, perhaps.
mechBgon is offline  
Old 02-12-12, 07:49 PM
  #8  
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2025 Post(s)
Likes: 0
Liked 1,091 Times in 737 Posts
My '85 Bridgestone 400 came with a Sun Tour ARX fd and it handled a triple SR crank with no problems and the SR bb spindle was installed with the long end toward the drive side. If, as you said, the high limit screw is backed out all the way, I expect a reversed or shorter bb spindle is the only way to go.
HillRider is offline  
Old 02-12-12, 08:22 PM
  #9  
Constant tinkerer
 
FastJake's Avatar
 
Join Date: May 2010
Location: Wisconsin
Posts: 7,954
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 184 Post(s)
Liked 92 Times in 75 Posts
Originally Posted by bikeman715
5 - 6 mm clearance is normal between the chainrings and the chainstay . you wouldn't want it closer then the derailer may not drop the chain onto the smallest
Rather than guess at your chainline based on chainstay clearance (irrelevant) why not just measure? According to Sheldon's chainline article https://sheldonbrown.com/chainline.html for a road triple you want a chainline of 45mm.

Once that is confirmed then see how it shifts. What size rings are you using? If your largest is a 48-50 you might be able to use an 80s MTB FD if you're looking for something cheap/available which might work better than the double FD you have now.
FastJake is offline  
Old 02-12-12, 09:11 PM
  #10  
Senior Member
Thread Starter
 
r0ckh0und's Avatar
 
Join Date: Jun 2009
Location: Plano, IL.
Posts: 1,618
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 135 Post(s)
Liked 196 Times in 97 Posts
Chainline is 45mm like it should be.................52-47-34 rings.

Rear chainline is 42/43mm
__________________
Be where your feet are.......Lisa Bluder


Last edited by r0ckh0und; 02-12-12 at 09:18 PM.
r0ckh0und is offline  
Old 02-13-12, 01:26 PM
  #11  
Senior Member
Thread Starter
 
r0ckh0und's Avatar
 
Join Date: Jun 2009
Location: Plano, IL.
Posts: 1,618
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 135 Post(s)
Liked 196 Times in 97 Posts
I flipped the spindle this morning and it pushed the small ring against the chainstay. So I re-installed the original way.

When I had originaly mounted the crankset back on it felt a bit wobbly on the square tapered spindle and when I removed it, it came off pretty easily, this time it felt snug prior to tightening. I did'nt think it would make that big of a difference but it does shift up to the large ring much better now. So, perhaps I did not have it tight enough or it needed to be in the same position on the taper as when it was first installed.

Thanks for the help all.
__________________
Be where your feet are.......Lisa Bluder

r0ckh0und is offline  
Old 02-13-12, 06:19 PM
  #12  
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2025 Post(s)
Likes: 0
Liked 1,091 Times in 737 Posts
Originally Posted by r0ckh0und
I flipped the spindle this morning and it pushed the small ring against the chainstay. So I re-installed the original way.

When I had originaly mounted the crankset back on it felt a bit wobbly on the square tapered spindle and when I removed it, it came off pretty easily, this time it felt snug prior to tightening. I did'nt think it would make that big of a difference but it does shift up to the large ring much better now. So, perhaps I did not have it tight enough or it needed to be in the same position on the taper as when it was first installed.

Thanks for the help all.
You got lucky. A crank arm installed on a square taper spindle and not torqued sufficiently WILL get loose while riding and WILL be ruined by having the square hole wallowed out by the spindle. Once the hole is distorted there is no saving it. Square taper crank arms have installation torque specs of 300 - 400 inch-pounds for a reason and that is much tighter than you would think.
HillRider is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
avhed
Classic & Vintage
15
10-28-18 01:42 PM
seedsbelize
Classic & Vintage
22
07-27-15 08:53 PM
vonfilm
Classic & Vintage
4
03-18-14 05:20 AM
campngolf
Classic & Vintage
9
08-02-13 09:12 AM
r0ckh0und
Classic & Vintage
0
02-12-12 10:40 AM

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.