From Triple chainring to double, what needs to be changed?
#1
Brown Bear, Sqrl Hunter
Thread Starter
From Triple chainring to double, what needs to be changed?
Other than obviously the chainrings themselves, what will I have to change in order for this to work?
The bike in question: https://www.bikepedia.com/quickbike/B...iple&Type=bike
(or at least using parts from that bike)
Do I have to get a new front derailleur/shifters/etc?
The bike in question: https://www.bikepedia.com/quickbike/B...iple&Type=bike
(or at least using parts from that bike)
Do I have to get a new front derailleur/shifters/etc?
#2
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you've covered it with the Crank and FD, the current shifters will work fine. but you will need to remember that they have an extra click (shift) that can't be used.
#3
Brown Bear, Sqrl Hunter
Thread Starter
Brings me to my next question, I know finding a new big ring must be harder than just picking one that has the same number of teeth, etc. What other measurements do I need to be aware of?
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Jaytron: When you set up the shifter/FD be sure to set it up so that the un-used shifter click is on the low end, that is, it slackens the shift wire further when you are on the small chainring. What you don't want is to be forgetful and attempt to pull more cable when the derailleur is already against the high limit stop. That could potentially jam the shifter ratchet.
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The standard double combinations are 53/39 or compact 50/34, if you want anything different, it will normally add to the cost as you will need to buy the regular cranks, and then additional chainings.
Also there is the cassette, there are many different combinations for this, dependant on what you go for, a longer chain may be needed.
#6
Brown Bear, Sqrl Hunter
Thread Starter
What are you trying to achive by going to a double from triple?
The standard double combinations are 53/39 or compact 50/34, if you want anything different, it will normally add to the cost as you will need to buy the regular cranks, and then additional chainings.
Also there is the cassette, there are many different combinations for this, dependant on what you go for, a longer chain may be needed.
The standard double combinations are 53/39 or compact 50/34, if you want anything different, it will normally add to the cost as you will need to buy the regular cranks, and then additional chainings.
Also there is the cassette, there are many different combinations for this, dependant on what you go for, a longer chain may be needed.
#7
Senior Member
Are you sure it is chipped? Some modern chain rings (and cassette cogs too for that matter) are made with some teeth shorter than others, as well as ramps and pins, to aid in shifting. It is possible that what you are seeing is not a chip but actually the way the chainring was made.
#8
Brown Bear, Sqrl Hunter
Thread Starter
Are you sure it is chipped? Some modern chain rings (and cassette cogs too for that matter) are made with some teeth shorter than others, as well as ramps and pins, to aid in shifting. It is possible that what you are seeing is not a chip but actually the way the chainring was made.
#9
Banned
Triple to double .. the crank chainline needs to come in..both chainrings.
where the middle ring was , is now needing to be the space between the 2 chainrings.
measure and get an appropriately shorter BB.
where the middle ring was , is now needing to be the space between the 2 chainrings.
measure and get an appropriately shorter BB.
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Jaytron: With a different frame, even if you keep the same cassette and chainrings, you will need to check to be sure you have the proper length of chain. Too short could lead to disaster.
#11
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You can keep the same FD. I just went from triple to compact double and replaced only the crank and matching bottom bracket.
#12
Brown Bear, Sqrl Hunter
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Any problems at all? I know somebody that did the same, and he says it's basically just more trim.
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Trying to get my Campagnolo Racing-T derailleur to work with an FSA 50-34 compact crankset I had to choose between not being able to shift to the big ring in all situations and often dropping the chain to the outside. A double front derailleur with different geometry and cage width worked perfectly.
#14
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I just lowered the FD to just barely clear the 50T and it works perfectly.
#15
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Not necessarily.
Trying to get my Campagnolo Racing-T derailleur to work with an FSA 50-34 compact crankset I had to choose between not being able to shift to the big ring in all situations and often dropping the chain to the outside. A double front derailleur with different geometry and cage width worked perfectly.
Trying to get my Campagnolo Racing-T derailleur to work with an FSA 50-34 compact crankset I had to choose between not being able to shift to the big ring in all situations and often dropping the chain to the outside. A double front derailleur with different geometry and cage width worked perfectly.
#16
Brown Bear, Sqrl Hunter
Thread Starter
One more question, if I just wanted to replace my large chainring, are there any measurements I need to find out or keep in mind when I'm shopping for a new one?
#17
Banned
Bolt circle... though if you reduce the difference between the 2 rings, like a 34/46, or 36/44
you won't get a triple FD to clear the inner without being extraordinarily high above the outer..
you won't get a triple FD to clear the inner without being extraordinarily high above the outer..
#18
Brown Bear, Sqrl Hunter
Thread Starter
If I replace just the chainring, I plan to keep it a triple. So if I get the bolt circle number, and match the number of teeth, I should be fine?