[phatcheeks]

t does make a huge difference. Not 100% as my 28T still rattles but close.....thanks!

Same here. It's just that one 28t cog that can't shift right. I have a brand new Derailleur hanger too.

 

[Harold]

I have a brand new Derailleur hanger too.

How many times does it need to be said that it doesn't matter if it's brand new? If you didn't put a gauge on it, you can't rule it out as the cause of the problem.

 

[phatcheeks]

How many times does it need to be said that it doesn't matter if it's brand new? If you didn't put a gauge on it, you can't rule it out as the cause of the problem.

Maybe one more time. I'll check it out

 

[dugt]

I think they don't suspect the new hanger as much as they suspect what the hanger is bolted to.

 

[phatcheeks]

I think they don't suspect the new hanger as much as they suspect what the hanger is bolted to.

That would suck if my frame or dropouts are bent. I've only put like 200 miles on this frame never crashed or dropped the bike.

 

[Outhouse]

i still hate my sunrace

 

[Desertride]

i still hate my sunrace

It's a sub-optimal substitute for a shimano cassette which is designed to mate in particular way with their 12 spd chain. Mine works ok at the moment but I have a SHimano hub and cassette waiting to swap it out.

That would suck if my frame or dropouts are bent. I've only put like 200 miles on this frame never crashed or dropped the bike.

It could be the frame is very slightly misaligned from the factory, or the mating surface not perfect, or other variations in manufacture, or any number of things. This ultra wide range narrow spaced cassette design is particularly sensitive to any misalignment. A removable hanger is meant to be adjustable using a gauge. Best go ahead and adjust it.

 

[Outhouse]

so this thread had me resurrect my tinkering. I ended up rebuilding a hardtail I thought I never would and used the sunrace on.

So believe it or not, removing the wolfstooth extender got it to shift a hair better, I also added the 12s gx chain that had some life left in it.

result,,, is it will shift through all gears now with slight hesitation I can live with up shifting to the smallest cog, and going from second largest cog up to 3rd smallest cog.

side note, reducing the B gap to as small as possible while shifting cleanly to largest cog, also was a contributing factor

 

[dugt]

Mine has started making a ticking noise when the chain is on the 38t cog. It shifts up and down fine in all gears but is ticks on that one cog. The alignment from the der to the cog looks good. I don't want to use the b screw to bring the der any closer to the cassette because I don't want to risk my new xt der.

 

[phatcheeks]

Mine has started making a ticking noise when the chain is on the 38t cog. It shifts up and down fine in all gears but is ticks on that one cog. The alignment from the der to the cog looks good. I don't want to use the b screw to bring the der any closer to the cassette because I don't want to risk my new xt der.

My derailleur is set pretty close to the cassette as well. When I drop a bunch of gears on the bike stand it hits the cassette and get caught. But when I'm riding I can drop many gears without issue.

 

[Ixaxaar]

Mine ticks on the 17-th cog, but not too much,slightly but rides perfect. BTw, I am not using that cog too often, so no problem for me. Everything works like a charm with the Sunrace cassette, the trick is to play with the H limit screw, the barrel adjustment and make sure to loosen the B tension screw so the teeth come on the half with the shimano mark on the derailleur At least, this works best for me.

 

[dugt]

Mine has started making a ticking noise when the chain is on the 38t cog. It shifts up and down fine in all gears but is ticks on that one cog. The alignment from the der to the cog looks good. I don't want to use the b screw to bring the der any closer to the cassette because I don't want to risk my new xt der.

I solved the noise problem by smearing a little lube on the next bigger cog. It seemed like the only place the noise could be coming from so I put some dry lube on it and now it is perfectly quiet. I was slow to try that because the noise continued no matter how tight or loose the shifter was set.

 

[bvillaret]

It's a sub-optimal substitute for a shimano cassette which is designed to mate in particular way with their 12 spd chain. Mine works ok at the moment but I have a SHimano hub and cassette waiting to swap it out.

It could be the frame is very slightly misaligned from the factory, or the mating surface not perfect, or other variations in manufacture, or any number of things. This ultra wide range narrow spaced cassette design is particularly sensitive to any misalignment. A removable hanger is meant to be adjustable using a gauge. Best go ahead and adjust it.

I would agree with Outhouse......I still hate my sunrace
Bottom line: Sunrace cassette is okay with 12S shimano but not optimal. Hours of fiddling with b screw, barrel tension and trials-and-errors for a shifting that is nowhere near what I was used to with Shimano. Will swap with Shimano Cassette (and microspline hub) soon...

 

[dugt]

I think this Sunrace cassette is not ready for prime time. They say it is designed to work with the Shimano 12S drive train so why doesn't it work better with the 12S drive train? If Sunrace got it to work well, they should include adjustment directions with the cassette.

I wish I would have gotten a full Shimano 11 speed drive chain instead of 12s. I'd rather have good shifting and quiet running than the extra gear and problems. I also don't like having my new XT derailleur closer to the cassette than recommended. Possibly another better solution is the SRAM Eagle 12 speed cassette with everything else Shimano 12S but it is all steel and weighs another 100g.

 

[phatcheeks]

I think this Sunrace cassette is not ready for prime time. They say it is designed to work with the Shimano 12S drive train so why doesn't it work better with the 12S drive train? If Sunrace got it to work well, they should include adjustment directions with the cassette.

I wish I would have gotten a full Shimano 11 speed drive chain instead of 12s. I'd rather have good shifting and quiet running than the extra gear and problems. I also don't like having my new XT derailleur closer to the cassette than recommended. Possibly another better solution is the SRAM Eagle 12 speed cassette with everything else Shimano 12S but it is all steel and weighs another 100g.

I will probably upgrade to Shimano microspline and slx cassette. I was able to sell my old Sram setup and can now use that towards my Shimano setup.

 

[Eneen]

Has anyone tried Sram chain with this Sunrace cassette? I'm about to purchase X01 chain with hard chrome plating due to it's durability.

I'm not sure about compatibility with Shimano chain here either. Sunrace has it's own "classic" design 12sp chain for MZ90 system. MZ90 *may* have same cog spacing as Shimano, but this new MZ903 (495g) cassette in contrary to Sram compatible MZX0 cassette is not described as "Shimano compatible" or something. I highly doubt that Sunrace has HG+ license and therefore should not be used with Shimano chain.

 

[Outhouse]

Has anyone tried Sram chain with this Sunrace cassette? I'm about to purchase X01 chain with hard chrome plating due to it's durability.

Yes, it wasnt really a game changer. The typical gx chain not the hollow pin version is all you need for a sunrace.

 

[dugt]

Has anyone tried Sram chain with this Sunrace cassette? I'm about to purchase X01 chain with hard chrome plating due to it's durability.

I'm not sure about compatibility with Shimano chain here either. Sunrace has it's own "classic" design 12sp chain for MZ90 system. MZ90 *may* have same cog spacing as Shimano, but this new MZ903 (495g) cassette in contrary to Sram compatible MZX0 cassette is not described as "Shimano compatible" or something. I highly doubt that Sunrace has HG+ license and therefore should not be used with Shimano chain.

I emailed Sunrace about this and they said I should use a Shimano chain. They said the 903 cassette was designed to be used with a Shimano 12x chain and any other chain would not shift as well and would be more noisey. My 903 works well with my Shimano chain except it makes noise on the 9th biggest cog if the 10th cog doesn't have a little lube on it.

 

[PuddleDuck]

Given some of the discussion on this thread, I thought that I'd share my successful and positive experience with this cassette

Firstly my set-up.

Hardtail, chainstay lenght of ~17.8"
135mm rear hub
Chainline of ~50mm

XTR chain, using wax as lube
XT mech
XT shifter
Sunrace cassette.

I followed Shimano's instructions to the letter, both for the install of the mech (including der hanger), and for chain length.

My set-up works. No issues. No noises. No lags. No skipping. It just works. I don't have to think about it.

If you are having issues, and haven't followed Shimano's instructions to the letter, I'd suggest you do that.

 

[dugt]

....If you are having issues, and haven't followed Shimano's instructions to the letter, I'd suggest you do that.

We had no reason to start any other way. When the shifting was bad, moving the derailleur closer to the cassette made sense so that is what we did and it works. When I move the der further from the cassette, the shifting gets bad again.

I wonder if Sunrace improved the cassette and you have an improved version of it.