Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-24-11, 03:53 AM   #1
barensadau
Newbie
Thread Starter
 
Join Date: May 2009
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Suntour Cyclone compatibility

Hi,
I'm riding a vintage bike with suntour cyclone derailleurs and friction downtube shifters

I have toured on it, but want to make some changes.

first off, I have two rings on the crank: 52 and 42, I believe. This makes climbing big, big, steep hills with gear harder than it needs to be. I'd like to put on a three ring crank.

anyone know if I will have to change my front derailleur to accomodate for this change?

Also, I'm riding on a six speed freewheel, and was wondering if anyone who has ridden on similar and upgraded to casette thought it was well worth it. My frame is steel, so it can potentially be spread back there.

Thanks!
barensadau is offline   Reply With Quote
Old 02-24-11, 07:35 AM   #2
rccardr 
aka: Dr. Cannondale
 
rccardr's Avatar
 
Join Date: Jul 2009
Bikes: I'd rather not count how many, thank you
Posts: 3,017
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
You will most likely have to change the FD to one with a broader spread range and with a cage that can accommodate the smaller ring. A Cyclone MkII triple would be a good choice, they are out there for $20 or so and the clamp (unique to the FD) fits 31.8 down tubes but you can use a shim adaptor to bring it down to 28.6 if that's the size you need. To go with that, you could mate up an SR Apex, Sugino or Sakae triple in either true triple (48/38/28) or half step plus grany (48/44/30) ring sizes. They can be found for about $45. Keep the six speed and friction setup- with the triple it will give you lots of gearing options- but if you need a wide ratio freewheel they can be found for under $25, plus another $8 or so for the FW removal tool (or have the LBS take off the old one). That way you keep the Suntour Cyclone type setup at a low cost.

You can PM me if you need more help, or go to the C&V forum.
__________________
Hard at work in the Secret Underground Laboratory...
rccardr is offline   Reply With Quote
Old 02-24-11, 07:56 AM   #3
vinfix
Steel80's
 
vinfix's Avatar
 
Join Date: Feb 2007
Location: NJ
Bikes: Bianchi Pista, Zebra fixie, Breezer Venturi, Breezer Lightning Pro
Posts: 526
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
I have a Cyclone MKII RD, I selected it for a vintage build because of it's wide range. I'm using it with a 7 speed freewheel up to a 28T.
I also have an '84 Schwinn LeTour Luxe with a triple that works well with the stock Suntour Mountech.
vinfix is online now   Reply With Quote
Old 02-24-11, 04:14 PM   #4
DannoXYZ 
Senior Member
 
DannoXYZ's Avatar
 
Join Date: Jul 2005
Location: Saratoga, CA
Bikes:
Posts: 11,600
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Are you doing the labour to upgrade yourself or paying a shop?
DannoXYZ is offline   Reply With Quote
Old 02-24-11, 05:16 PM   #5
TLCFORBIKES
Senior Member
 
TLCFORBIKES's Avatar
 
Join Date: Feb 2010
Location: Raleigh NC
Bikes: 1983 Gureciotti/full SR 2002 Casati Record 10 speed 1995 Colnago C40 2007 Sram Rival 2006 Isaac Sram Force 2000 DEAN Ti DA 10 speed 1987 Schwinn Prologue Funny Bike 2001 Pinarello DA 9 speed 2008 Element6 Record 10speed Origin8 Lutegra10speed
Posts: 324
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Go with a triple FD & RD and a new chain (you will need more chain links to original chain if you do not use a new chain). I bet you are looking forward to spinning up the hills vs grinding up the hills.
TLCFORBIKES is offline   Reply With Quote
Old 02-26-11, 03:32 PM   #6
nwbikeman
Senior Member
 
Join Date: Aug 2010
Location: Washington
Bikes: Serotta Davis Phinney, 1992 Serotta T Max,1984 Specialized Allez, Olmo, 1974 Strawberry,Redline bmx, ect.,
Posts: 472
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You might not need to do a full swap. Some of these cranks were drilled for a triple ring, you didn't mention what the crank is but it should take a 39t inner ring possibly smaller depending on the bolt circle diameter of the crank. As for the rear deraileur it will sometimes take a lot bigger cog on the older frames because some frames had a longer distance between the axle dropout and the hangers mount. I have several bikes with a short cage rear deraileur shifting a 7 speed freewheel with a 12-34 and does not bottom out on the deraileur with a double crank. if you have about a 1/4" between the high gear cog and the frame you should be able to mount a 7 speed freewheel to you stock wheel as well.
nwbikeman is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 02:22 PM.