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Cassette capacity for a Suntour Cyclone RD?

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Cassette capacity for a Suntour Cyclone RD?

Old 01-06-18, 11:04 AM
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Dougbloch 
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Cassette capacity for a Suntour Cyclone RD?

Iíve been running a 1x7 Dura Ace 12-19 corncob freewheel on a Suntour Cyclone RD and just bought a new 650b wheel set with an Ultegra cassette hub. I really only run a few gears as I live in a flat area. I am new to cassette hubs so my question is how many cogs will the Cyclone handle? Or how hard is it to remove the cogs I wonít use and substitute spacers?

Thanks
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Old 01-06-18, 12:51 PM
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what do you mean by "cog capacity"? If you mean the maximum number of gears in the back, probably 7 (126mm DO spacing) if it was designed as 5 speed (120mm DO spacing). If you mean max tooth count, I can fit barely fit a 28 tooh rear cog which is 4 teeth over the stated capacity. disrealigears is a good resource. Just find your specific derailleur. Velobase might have it if you know your exact model.
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Old 01-06-18, 01:00 PM
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You might be able to use a 12-23 eight speed cassette. You won't have any chain wrap or maximum cog size issues. However, it might be difficult to shift to the large cog, simply because the geometry won't allow the idler to move sufficiently. Unfortunately you won't be able to determine how many cogs it will reliable shift from chain wrap data or cog size specifications.
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Old 01-06-18, 01:01 PM
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Originally Posted by Ferrouscious View Post
what do you mean by "cog capacity"? If you mean the maximum number of gears in the back, probably 7 (126mm DO spacing) if it was designed as 5 speed (120mm DO spacing). If you mean max tooth count, I can fit barely fit a 28 tooh rear cog which is 4 teeth over the stated capacity. disrealigears is a good resource. Just find your specific derailleur. Velobase might have it if you know your exact model.
Thanks. I meant maximum number of gears. My spacing is 126mm.
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Old 01-06-18, 01:11 PM
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I can vouch for 7 speeds, also for a 26T large cog.
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Old 01-06-18, 01:14 PM
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Thanks everyone!
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Old 01-06-18, 04:00 PM
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There's no real reason you couldn't shift 11 with that derailleur. The total width of 11 is only 3mm more than 8 speed.

I'm using an old friction Mavic RD with 8. The one issue I range into was that the inner cage plate got very close to the spokes, so I put a 1mm spacer under the cassette.

I'm not saying it will or won't work with any particular set up, I'm saying that the actual width difference between different 130mm hub formats is very small.
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Old 01-07-18, 09:08 AM
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Originally Posted by Kontact View Post
There's no real reason you couldn't shift 11 with that derailleur. The total width of 11 is only 3mm more than 8 speed.

I'm using an old friction Mavic RD with 8. The one issue I range into was that the inner cage plate got very close to the spokes, so I put a 1mm spacer under the cassette.

I'm not saying it will or won't work with any particular set up, I'm saying that the actual width difference between different 130mm hub formats is very small.
i have run an 8 speed with that derailleur with no problem.
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Old 01-07-18, 11:43 AM
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Having really struggled to get an Allvit derailer to move the chain across a standard 6s freewheel, I can say that often it is important to get the freewheel positioned within the travel range of the derailer.
That can mean fine-tuning the rear hub axle spacing for optimal freewheel positioning, especially when a claw-mount derailer hanger is used.
Having said that, your Cyclone mech should at least easily handle the width of any 7s freewheel, but going beyond a 26t largest cog may require fine-tuning the chain length and the position of the rear axle in the dropout slots.
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Old 01-07-18, 09:01 PM
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Originally Posted by Dougbloch View Post
I really only run a few gears as I live in a flat area.
Alameda, sure, but just a few miles away you've got the Oakland Hills. Try 'em sometime, lots of great riding between you and Moraga...

I run 8 speed cassette and use a Cyclone rear derailleur with no problem.
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Old 01-08-18, 12:46 AM
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Originally Posted by gugie View Post
Alameda, sure, but just a few miles away you've got the Oakland Hills. Try 'em sometime, lots of great riding between you and Moraga...

I run 8 speed cassette and use a Cyclone rear derailleur with no problem.
Thanks gugie! Lots of great riding here in the East Bay, but like most Alamedans I never seem to leave the island...
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Old 01-08-18, 12:57 AM
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I ran my custom set up 9-speed and spaced 130 with (probably a later) Cyclone GT with no issues at all. On a regular Cyclone the chain wrap and cog capacity is going to be the same as it was for 5 and 6-speeds.

I ran the GT with 53-42-28 in front and 12-25, maybe 28 in back and had good shifting throughout the range. (That was almost 10 years ago so my memory isn't perfect. The Cyclone works and shifted beautifully but I just felt it was a little light to be shifting that big a range on a bike that was probably going to get many miles. Took me several derailleurs to find one as nice to shift.)

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Old 01-08-18, 07:45 AM
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My own example of the short cage version is happy with seven cogs (as you know), the largest of which has 28 teeth (which isn't what you're asking about, but might interest some people).
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Old 01-08-18, 10:08 AM
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I'm running a Cyclone GT RD with a 14-32 7-speed freewheel (Suntour New Winner with Ultra-7 spacing) and 52/41 chainrings. The B-Screw had to be turned in nearly all the way to clear the 32-tooth cog, but it shifts great.

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Old 01-08-18, 11:13 AM
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I have a cyclone running a shimano 9 speed cassette that I removed the 11t from to make 8 speed. its now 13-30t, and works fine.

edit: its on a compact double front 48/34 - which helps with any wrap up issues

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Old 01-08-18, 11:17 AM
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Just 1 chainring reduces the additional wrap up demand, that a difference between bigger and smaller front chainrings makes...

so then its just the differences between largest and smallest cog tooth count..










..


.

Last edited by fietsbob; 01-08-18 at 11:22 AM.
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