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Suntour Accushift question options.

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Suntour Accushift question options.

Old 02-28-19, 08:02 PM
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zukahn1
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Suntour Accushift Chain question options.

The question I have is will a Sram 900 series chain work with 6/7 xt accushifht ? I'm asking because there a bunch of deals on nice 900 series chains some under $10 and I need a new chain for my recently found beater MTB with 6 speed narrow medium Accushift XC. The current cheaper KMC and Shimano stuff seems to be kinda junk since they went to China and the nicer 800 series srams which I know work nice are a bit more money wise about $20 for the 870 which seems to work best based on experiance.

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Old 02-28-19, 08:26 PM
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I've used Shimano 6/7/8 speed chains, and SRAM 850 and 870 on 6 speed Accushift systems.
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Old 02-28-19, 11:14 PM
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Nothing wrong with KMC chains. They're comparable to Shimano. I've used the KMC Z-51 and Z-72 successfully with my Ironman's GPX Accushift group. Shifts fine, runs smoothly, even better with the SunRace 7-speed 13-25 chromed freewheel than with the original Suntour. Far better than the original Suntour chain, which was crudely made compared with the KMC.
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Old 03-01-19, 02:14 AM
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For Accushift systems, I prefer to always use a slightly narrower chain than was original to the specific gear count.

So, for a 6s Accushift system, a chain narrow enough for 7-8s is perfect, and for 7s Accushift, a 9s chain is perfect.

KMC chain is good but I really prefer their X-series over their Z-series for any application where serious mileage will accrue.

There is a notably poor roller-to-roller distance consistency that I notice when measuring Z-series chains, though they work well and are not prone to breakage.
Z-series is considered race-quality and is better in every way included it's rated tensile strength.

Shimano chain comes up as my favorite in terms of shifting performance, especially in the 9 and 10-speed widths.
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Old 03-01-19, 02:27 AM
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I started out with straight-plate chains like the KMC Z-33. Chamfered inner plate but nothing fancy. Those work fine on my comfort hybrid errand bike with Shimano RevoShift twisty grip shifters. And they worked on my Ironman when I switched from Suntour GPX rear derailleur to Shimano 600 with friction shifting.

But when I went back to the GPX RD and index shifting the KMC Z-51 and Z-72 with fancy Z-Bridge plates, those fancy chain shapes did help with index shifting. Snick-snick, no hunting, no rattling, no drama.

In friction mode it gets really fussy -- gotta trim the shifter just right to eliminate any chain noise. The Z-33 chains were a bit narrower, a bit less prone to needing trimming to avoid chain noise.

But now I have the Accushift setup working well with the Z-51 and Z-72 chains. Makes quick shifting much easier to keep up momentum and spinning in my sweet spot on fast rides on undulating roller coaster routes. I usually run a video camera on the handlebar for safety, and it happens to pick up my hand movements to shift, and the sounds of shifting. I've noticed my shifting motions are much quicker with index shifting now that I've got the Accushift dialed in. In my older videos with friction shifting my hands were off the bar a bit longer, spending more time trimming the levers, etc. Usually not a big deal, but on those roller coaster routes with lots of short, steep climbs it adds up to a few seconds over the 5-6 mile segments.
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Old 03-01-19, 10:44 AM
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Eh, but now you'll have to add in the power-meter data!
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Old 03-15-19, 04:54 AM
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Originally Posted by canklecat View Post
Nothing wrong with KMC chains. They're comparable to Shimano. I've used the KMC Z-51 and Z-72 successfully with my Ironman's GPX Accushift group. Shifts fine, runs smoothly, even better with the SunRace 7-speed 13-25 chromed freewheel than with the original Suntour. Far better than the original Suntour chain, which was crudely made compared with the KMC.

Replying to your Sunrace comment. I have an all original Sprint 9000 group on my Ricardo I was getting ready for a hills ride. It has a Winner 13-21 with the original Suntour chain, talk about noisy with not perfect but ride able shifting. I swapped to a 9s Shimano chain it became quiet with slightly better shifting but still not perfect. I found a Sunrace 13-25 freewheel laying around and gave it a go thinking it wouldn't work, there Shimano compatible aren't they? Bingo it's perfect, sharp positive shifts and quiet and no freewheel wobble . It's going to be better in the hills now but don't think I could go another tooth bigger on the inner ring
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