If I go from a 12-25 to a 12-28 will it work with a sram rival short cage derailleur ?
803923
It depends on the size chain rings that you have. Rear derailleurs are designed to be able to hand the maximum difference in the number of teeth on your entire drive train. Total Difference = (Teeth on Big front chain ring + teeth on largest cog (ex: 28 above)) - (Teeth on small front chain ring + teeth on smallest rear cog (11 in your question). Then you need to look up the capacity for your specific derailleur. Make sure to match the right derailleur size and model year as they change. Good luck.
1508655
Depends on the existing deraileur, things like long cage and shifter components being shimano compatible have to be there. Chain length may need to be addressed.
1282568
Yes. It works with all 21 speed bikes. I would check the derailleur first and make sure that your screws aren't out of adjustment. There are good videos on YouTube telling you how to do that. If that doesn't fix it, the grip shifters are a good choice.
1982638
I think it should work, the derailleur will need to be adjusted for the extra travel. The biggest challenge is probably getting the 40 year old freewheel off the hub
72151
Yes. Those are the ones on my bike. But your derailers might have a different ratio and that could cause incosistancies when shifting.
983856
I believe it will. All Shimano (and Sram) hubs and cassettes use the same groove pattern.
1309072
Yes. The mount on the derailer itself is 35.0mm. Shims are included for 28.6mm and 31.8mm frames.
2062765
No, you must pair it with a derailleur that has a 1:1 ratio. They worked very well with the matching SRAM derailleur.
1572463
I don't know. I matched this item to my bike. It is not identical to the factory derailer, but works great. Match as close as you can is my only suggestion.
1706952
NO! No, it will not work. The SRAM shifters only work with SRAM rear derailieurs, because the ratio is 1:1 vs Shimano 2:1. The front derailieurs for both systems are interchangeable as they use the same ratio.
340275
The main thing is, SRAM REAR derailleurs will only work with SRAM REAR shifters, and vice versa. You can never use SRAM with Shimano in the back. It doesn't matter in the front.
1762672
Should work. Im using a Shimano TZ20 6 Speed Freewheel on mine which fit perfectly, it should be the same other then it being a 6 speed instead of the 7.
1441273
It should adjust to fit BUT a lot depends upon your shifters, cables etc.... If you have thumb shifters I think it will work. I have seen a 7 speed Shimano click shifter work but of course it had to be adjusted to fit...I use new 6 speed twist shifters and cables when I work on a bike. For this job the time the old derailleurs will work most of the time.. It's not a big difference going from 5 to 6 speed but I don't think 7 is worth the trouble... I have stopped using this particular cassette and now use the 34 teeth low speed since our local area has some big hills......Good luck..
271951
yes, assuming you have 7 speed rear deraillure shifter and chain. The width of the cassette is usually the same, it's the width of the gears plus spacing between the gears that are different.
1753347
Yes, it will work fine assuming you have the correct shifters (sram 1:1/x.# whatever). If your previous mech was a x.5 you shouldn't have a problem. Having single, double or triple up front doesn't make a difference.
441477
It certainly looks as though it would. Both are 7-speed freewheels of the same overall range. There might be some minor differences in the between cogs, but nothing that should prevent it from working well.
1778884
if you read in the description this derailleur will handle a maximum 34 tooth cog,yes it will work!!