Need a new jockey wheel for a DA 7400 RD
03-24-15, 10:24 PM
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Clark W. Griswold
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Need a new jockey wheel for a DA 7400 RD
As the title states I need a new jockey wheel as my lower jockey wheel is looking worn out and is effecting shifting and chain retention. I am wondering what I should do? I know I can get modern Tourney level pulleys (via our distributors at the shop) that would fit the correct chain size but they are Tourney and also may not work for other reasons.
I am not looking to spend a whole lot unless I am making a significant upgrade so buying a new RD is probably out of the question at least for right now, plus I would rather just get a new pulley.
Thanks in advance for the help.
I am not looking to spend a whole lot unless I am making a significant upgrade so buying a new RD is probably out of the question at least for right now, plus I would rather just get a new pulley.
Thanks in advance for the help.
03-24-15, 11:39 PM
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Check out Tacx as they make some nice sealed bearing jockey wheels. Come with a bunch of adapters. I bought a set for my Super Record derailleur and they work perfect.
03-25-15, 09:55 AM
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Clark W. Griswold
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Is there anything that really matters aside from maybe tooth count when going aftermarket? If I say get something for a 9-11 speed would that make a huge difference?
03-25-15, 11:00 AM
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Plain old 1050/6400/1055 series 10 tooth jockey wheels will work just fine. Sealed bearings (actually, bearings at all) are overkill for this application. Properly lubricated bronze bushings will do the trick and will also improve your shifting...for about $10.
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04-20-15, 11:30 AM
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Lower (Tension) wheel at Loose Screws Loose Screws Bicycle Small Parts Hard to find bicycle parts, made easy! For both the classic and modern cyclist. for $17.
A set of Upper (Guide) and Lower wheels from Tacx will cost $15-20, depending where you get them from.
A set of Upper (Guide) and Lower wheels from Tacx will cost $15-20, depending where you get them from.
04-20-15, 11:40 AM
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The lower/tension doesnt matter too much but it's very important that the upper/guide pulley be of the 'floating' design as its the key to indexed shifting.
Keep in mind that the lower pulley has little to nothing to do with shifting...
Keep in mind that the lower pulley has little to nothing to do with shifting...
04-20-15, 11:47 AM
#10
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The index shifters rely on a sideways float of the top pulley, why not ask at your LBS for a 10t Shimano Pulley set ,
current DA stuff is 11 t so they may not have it in stock, on speculation.
current DA stuff is 11 t so they may not have it in stock, on speculation.
04-20-15, 01:00 PM
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The width of the assembled pulley can be critical to the bolt retention, and I think this derailer needs a .41" width.
Also key to the bolt retention is for the bolt to clamp clean metal parts, NO plastic washers/bushings (unless you can assure the use of good Loctite on the bolt's threads).
Having a pulley bolt lose tension can cause mechanically destructive issues and can even cause an accident.
I suspect that the pair of 10t Tourney pulleys will fit and work perfectly and last a long time. If you're just replacing the lower pulley, that leaves you with a new spare pulley.
Also key to the bolt retention is for the bolt to clamp clean metal parts, NO plastic washers/bushings (unless you can assure the use of good Loctite on the bolt's threads).
Having a pulley bolt lose tension can cause mechanically destructive issues and can even cause an accident.
I suspect that the pair of 10t Tourney pulleys will fit and work perfectly and last a long time. If you're just replacing the lower pulley, that leaves you with a new spare pulley.
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