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Going from a 11-25 to 12-30 cassettee

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Going from a 11-25 to 12-30 cassettee

Old 07-14-13, 05:39 PM
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BobBlooms
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Going from a 11-25 to 12-30 cassettee

Just attempted to install a new 12-30 Cassette on my Foil 40 which came with a 53/39 Crankset and a 11-25 Cassette. Got it all together and the Rear Derailleur will not move in to pick up the 30 tooth. What do I need to do? BTW, I am pushing 73 years old and I need a lot of help on the 10 percent grades.
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Old 07-14-13, 05:45 PM
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Return the bike and get one with a compact crank set 50/34.


It will work with the 12/30 cassette.
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Old 07-14-13, 05:47 PM
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What's a Foil 40?

Did you lengthen the chain the proper amount?
Adjust the "B" screw?
What RDER does it have. It may not be able to handle a 30T cog.
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Old 07-14-13, 05:53 PM
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First, make absolutely certain that your chain is long enough to engage the big chainring (in front) and the big cog(rear) without straining the derailleur. Do this by turning the crank GENTLY as you shift and STOP if there is significant resistance.

If your chain was near the minimum length required for the 25T cog it will be too short for the 30T and can cause extensive damage if you accidentally shift into that combination while pedaling.

Assuming that your rear derailleur will handle the 30T cog (not guaranteed that it will) you should be able to adjust the derailleur using this procedure: http://www.parktool.com/blog/repair-...nts-derailleur

Make certain that there are not any unneeded spacers (perhaps left over from the old cassette) under the cassette before you begin; if present they will push the cassette away from the hub and possibly out of reach of the derailleur.
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Old 07-14-13, 05:58 PM
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The Foil 40 is an entry level full carbon put out by Scott. The Rear Derailleur is a Shimano 105, RD-5700A,
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Old 07-14-13, 06:04 PM
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I guess I could type this in a white font and really make things difficult.

The RDER should be capable of handling an 11-30 cassette per Shimano spec's, so that's not the problem.
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Old 07-14-13, 06:05 PM
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Originally Posted by BobBlooms View Post
The Foil 40 is an entry level full carbon put out by Scott. The Rear Derailleur is a Shimano 105, RD-5700A,
This one says it comes with a choice of 53/39 or 50/34 cranks:
http://www.scott-sports.com/global/e...21876/foil-40/
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Old 07-14-13, 06:17 PM
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The 53/39 is great in Florida, but not in New England. I have had the bike for about 18 months now and looking for quick fix until I get a new bike with a compact crankset.
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Old 07-14-13, 06:21 PM
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Going out tomorrow to pick up some new chain to see if that makes it work. I think that may be the problem as the derailleur pulley is up close to the 30 tooth cog.
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Old 07-14-13, 06:23 PM
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Originally Posted by BobBlooms View Post
The 53/39 is great in Florida, but not in New England. I have had the bike for about 18 months now and looking for quick fix until I get a new bike with a compact crankset.
If you're going to go through the trouble get a triple. 53-39-26 x 12-23 yields the same low gear as 50-34 x 12-30 but has one tooth jumps through the 19 cog.
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Old 07-14-13, 06:25 PM
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Drew you are correct. I have an old Trek triple hybrid that I could climb with. However, I need one of my sons to help be put it in the back of the pick up
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Old 07-14-13, 06:25 PM
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Originally Posted by BobBlooms View Post
Going out tomorrow to pick up some new chain to see if that makes it work. I think that may be the problem as the derailleur pulley is up close to the 30 tooth cog.
Get a longer derailleur and a 11/34 cassette.
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Old 07-14-13, 06:40 PM
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Originally Posted by dsbrantjr View Post
First, make absolutely certain that your chain is long enough to engage the big chainring (in front) and the big cog(rear) without straining the derailleur. Do this by turning the crank GENTLY as you shift and STOP if there is significant resistance.

If your chain was near the minimum length required for the 25T cog it will be too short for the 30T and can cause extensive damage if you accidentally shift into that combination while pedaling.

Assuming that your rear derailleur will handle the 30T cog (not guaranteed that it will) you should be able to adjust the derailleur using this procedure: http://www.parktool.com/blog/repair-...nts-derailleur

Make certain that there are not any unneeded spacers (perhaps left over from the old cassette) under the cassette before you begin; if present they will push the cassette away from the hub and possibly out of reach of the derailleur.
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Old 07-14-13, 06:40 PM
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"the derailleur pulley is up close to the 30 tooth cog." Besides making sure the chain is long enough the "B" screw will likely need to be adjusted to clear the new larger cog. This adjustment is covered in the Park Tool procedure.
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Old 07-14-13, 06:48 PM
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Originally Posted by 10 Wheels View Post
Get a longer derailleur and a 11/34 cassette.
According to Competitive Cyclist, this RD has a capacity of 33 teeth. This gearing configuration requires 32. Unfortunately, the max cog size it will accommodate is 28.

What your will need is this: http://www.amazon.com/Shimano-5701-D.../dp/B007Q4N8LQ

http://www.competitivecyclist.com/pr...6545.25.1.html
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Old 07-14-13, 06:54 PM
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Originally Posted by bikepro View Post
According to Competitive Cyclist, this RD has a capacity of 33 teeth. This gearing configuration requires 32. Unfortunately, the max cog size it will accommodate is 28.

http://www.competitivecyclist.com/pr...6545.25.1.html
I real life that is Not True.

My Felt has a 11/34 cassette that works. Shimano says 28 T is the limit.

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Old 07-14-13, 07:03 PM
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Originally Posted by 10 Wheels View Post
I real life that is Not True.

My Felt has a 11/34 cassette that works. Shimano says 28 T is the limit.

Thanks, it looks like all the OP needs is a longer chain.
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Old 07-14-13, 07:20 PM
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Originally Posted by 10 Wheels View Post
I real life that is Not True.

My Felt has a 11/34 cassette that works. Shimano says 28 T is the limit.

In real life on your bike this works. Longer derailleur cages do NOT mean a derailleur will work w/ larger than spec'd cogs. The ONLY thing a long cage does is wrap more chain. Period. It does not do anything else. All Shimano road derailleurs like yours have the same max cog size rating, the ONLY difference is the capacity to wrap chain on a triple. Whether or not the derailleur works is more a function of how long the derailleur hanger is than anything else. Shimano says 27 on that derailleur, not 28, is the max cog because that is what they can be certain will work on any bike. In real life 28 will work every time because it's only 1 tooth over. But that is all you can say with certainty...any other combination needs to be tested to confirm it will work, and my money says anything over 30 is not working very well (B screw buried or reversed is known as "not doing it right").
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Old 07-14-13, 09:16 PM
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Originally Posted by bikepro View Post
According to Competitive Cyclist, this RD has a capacity of 33 teeth. This gearing configuration requires 32. Unfortunately, the max cog size it will accommodate is 28.

What your will need is this: http://www.amazon.com/Shimano-5701-D.../dp/B007Q4N8LQ

http://www.competitivecyclist.com/pr...6545.25.1.html
Or you can look at the Shimano Tech Doc which states a max cog size of 30.
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