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Rear derailleur cage rubs on freewheel

Old 02-12-22, 10:00 AM
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Jicafold
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Rear derailleur cage rubs on freewheel

So I am assembling this Specialized Sirrus. No original parts. 14 speed index shifting. The top of the rear derailleur cage will rub on the 2 largest sprockets when running in the lower gears. See in photo #1. The B adjustment screw is maxed out. The chain is not too long as shown when in small/small in photo #2. I have had the rear cable barrel adjuster all over the map with little improvement, although the pulleys are a bit off in the photo. What else is there to consider to stop it rubbing? Thank you.


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Old 02-12-22, 12:22 PM
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Do you know if the specification for the DR say it's supposed to be able to clear a cog with that many teeth?
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Old 02-12-22, 12:36 PM
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Originally Posted by Jicafold View Post
So I am assembling this Specialized Sirrus. No original parts. 14 speed index shifting. The top of the rear derailleur cage will rub on the 2 largest sprockets when running in the lower gears. See in photo #1. The B adjustment screw is maxed out. The chain is not too long as shown when in small/small in photo #2. I have had the rear cable barrel adjuster all over the map with little improvement, although the pulleys are a bit off in the photo. What else is there to consider to stop it rubbing? Thank you.
Itís probably time to get a different derailer. Your derailer appears to be a Sora RD-3300 which has a maximum large cog capacity of 27 teeth. While you can push some derailers outside of that, Shimano road derailers are usually pretty strict about that limit. You could add a Wolf Tooth Road Link but thatís a bit expensive for an inexpensive derailer. You could get a more modern 9 speed Sora (still works) for about $35. Or you could get a 9 speed Altus for around $25. Both would handle what appears to be a 14-34 Mega Range freewheel.
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Old 02-12-22, 01:02 PM
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Originally Posted by cyccommute View Post
IYour derailer appears to be a Sora RD-3300 which has a maximum large cog capacity of 27 teeth. .
I was thinking that may be true for the short cage and I have the long cage, but literature says it has 27 tooth capacity for short and long cage. I have a box of derailleurs. I'll try a different one. Thank you.

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Old 02-12-22, 04:28 PM
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Try removing the cage inner plate and reinstalling it right side up. Andy
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Old 02-12-22, 05:19 PM
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Originally Posted by Andrew R Stewart View Post
Try removing the cage inner plate and reinstalling it right side up. Andy
I think your are right.

Quite obviously some of us deserve a slap to the back of the head. I looked at the picture originally, thought it odd the cage plate came so high, then immediately forgot it and went on to other what if's.

https://si.shimano.com/api/publish/s...-3300-1882.pdf
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Old 02-12-22, 05:53 PM
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Originally Posted by Andrew R Stewart View Post
Try removing the cage inner plate and reinstalling it right side up. Andy
Ahhh.....Andy you are a wiz. It is upside down. Thank you.
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