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Can I use a SAINT derailleur on a 7-spd cassette?

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Can I use a SAINT derailleur on a 7-spd cassette?

Old 01-29-19, 06:58 AM
  #1  
AlbertoDeSantis
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Can I use a SAINT derailleur on a 7-spd cassette?

Hello Mechanics,
I spent 1 year testing a rowing bicycle, which I plan to mass produce this year. Itís similar to the ďKontech DesignĒ rowing bicycle.
Question: Since it performs beautifully with a 7-speed cassette, and I want to have the highest chain tension possible, can I use a Shimano SAINT short cage rear derailleur? I heard they have the highest tension spring.
Any compatibly issues?

Thank you very much in advance.

Alberto
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Old 01-29-19, 10:40 AM
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wesmamyke 
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Older 9spd compatible Saint derailleurs would work. The newer 10spd version will not as the cable pull is different.

Most of the 9spd ones will require a solid threaded axle to mount. Little window between the two styles where they mounted normally but were still 9spd I think.
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Old 01-29-19, 12:18 PM
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(Sight unseen?) Probably .. the indexing is in the lever.. not the RD.. find how short a chain you can get away with... there is your tension ...
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Old 01-29-19, 06:14 PM
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What shifters are you proposing?
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Old 02-12-19, 05:58 PM
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AlbertoDeSantis
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Thumb shifters for 7 speeds

Hello
Thank you and thank you to all who replied.
I will use a Shinano thumb shifter 7-speed.
I assume that the less cogs in the cassette, the more forgiving the alignment. I cannot afford to have the chain jam in the derailleur cage when said chain travels backwards through said derailleur as the rower returns the rowing lever to the front of the bike. So, itís regular chain travel when you row fore to aft, and backwards chain travel when you return the lever back to front of the bike.

Thanks
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Old 02-12-19, 06:22 PM
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AlbertoDeSantis
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My RD uses a hanger. How about Zee?

Hello again guys.
My rowing bike will use a hanger instead of a solid axle. Unless you guys think Iím wrong. I respect bicycle mechanics. So Iím all ears. I used to be friends with a guy named MONKEY who was the mechanic for Mert Lawill and Shawn Palmer. I respect you guys dearly.
Since itís a rowing bike, I will be selling probably 5 a month only, so I donít mind buying 5 rear derailleurs on eBay. What I want to clarify from you geniuses is that 7 speeds is more forgiving than 8 and 9 speed cogs for a rear cassette. Remember that my chain travels backwards in the return stroke of the row. So I donít want the chain to jam on the derailleur cage. The rowing bike needs very very minimal gear-up ratio . 90% of the time you are rowing on the 11-tooth cog. Having said that, which short cage rear derailleur has high tension and uses a derailleur hanger and can be used with 7 speeds? If it makes no difference in alignment forgiveness, I can go up to 9 speeds.

Thanks
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Old 02-12-19, 08:46 PM
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Can you fit an auxiliary spring to pull on the rear of the derailleur cage to increase the tension. One end of the spring obviously goes to the lower end of the cage and the other to a fixed mount on the rowing bike.
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