Front Derailleur question
02-18-15, 08:42 AM
#1
Senior Member
Thread Starter
Join Date: Jan 2014
Posts: 76
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Front Derailleur question
Hi,
Currently I have a 28-38-48 setup. I was thinking of changing to 30-39-50 setup, would the derailleur work with this as its not massively bigger?
thanks for the help,
Currently I have a 28-38-48 setup. I was thinking of changing to 30-39-50 setup, would the derailleur work with this as its not massively bigger?
thanks for the help,
Last edited by Ali89; 02-18-15 at 08:46 AM.
02-18-15, 08:50 AM
#2
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,174
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4240 Post(s)
Liked 3,980 Times
in
2,365 Posts
Most likely yes. It will need to be raised on the seat tube by a small amount to maintain the cage/big ring clearance and then the adjustments should be double checked for their still being correct. Depending on how close to the minimum chain length is currently on the bike the chain might need a link more length. Andy.
02-18-15, 09:10 AM
#3
Really Old Senior Member
Seems like a lot of expense for a relatively small change.
Unless the old crank is worn out.......
You may need a different BB too.
Unless the old crank is worn out.......
You may need a different BB too.
02-18-15, 09:36 AM
#4
Mechanic/Tourist
+1 If you can get a great deal on the larger range crankset I can understand it, otherwise I think it's a waste of time and money.
02-19-15, 12:36 PM
#5
Senior Member
Thread Starter
Join Date: Jan 2014
Posts: 76
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Thanks for the replies.
The big ring on the old crank is getting pretty worn, unfortunately its not possible to replace without replacing the whole crankset. I can get a good value 50-39-30 option for £20.
The big ring on the old crank is getting pretty worn, unfortunately its not possible to replace without replacing the whole crankset. I can get a good value 50-39-30 option for £20.
Last edited by Ali89; 02-19-15 at 01:02 PM.
02-19-15, 01:06 PM
#6
aka Phil Jungels
I've often thought that a 30-40-50 is the perfect triple range......
02-19-15, 01:10 PM
#7
Really Old Senior Member
02-19-15, 01:13 PM
#8
Really Old Senior Member
IF you can find the same model, you don't have to deal with replacing the Bottom Bracket. Have you considered THAT expense?
02-19-15, 01:32 PM
#9
Senior Member
Thread Starter
Join Date: Jan 2014
Posts: 76
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I have looked for the same size but thought that a slightly bigger gear wouldn't be a bad thing. I would still buy 28-38-48 if it were necessary or better value or whatever. Why would the bottom bracket need to be replaced? Both the old and (potentially) new crankset are square taper.
02-19-15, 02:00 PM
#10
Lost at sea...
Join Date: Dec 2012
Location: Western PA
Posts: 935
Bikes: Schwinn Paramount (match), Trek 520, random bits and pieces...
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Most likely the FD will work without issue... but it depends on the specific FD too, you can't expect definitive answers from an online forum when you aren't posting the specific model numbers!
02-19-15, 06:09 PM
#11
Mechanic/Tourist
Cranksets can take different spindle lengths depending on where the chainrings run in lateral relationship to the area where the crank arm seats on the spindle. More recent cranks take a shorter spindle because the chainrings are further out in relationship to the seating area.
