Drew, These shifters have a friction mode, yes ?  If they shift and hold 
all the gears in friction, but not with indexing it would either be wonky 
shifters or they are very sensitive to tension. The LX RR has a cable 
tensioner yes ?  Play around with it slightly as you're shifting and see 
where/when/if it's hold those middle gears. 

The middle cogs on 9-speed cassettes, like the 18-21-24 are most prone to 
wandering, so the derailleur position needs to be "just right" to hold the 
cogs. 
On Sunday, February 27, 2022 at 10:59:47 PM UTC-5 Joe Bernard wrote:

> On a new bike yes, the cable has probably stretched. If you're not 
> familiar with fiddling with indexing I'll try a short explainer. 
>
> If you have the older style Deore there will be a cable adjuster on the 
> derailer where the housing ends. Put your bike in the middle cog (5th gear 
> on a 9-speed). Is the pulley directly under that cog? You can turn the 
> adjuster counterclockwise to move it leftward, towards the bigger cogs; 
> clockwise to move right, closer to the smaller cogs. Shift up and down the 
> cassette, you'll probably need to do this a few times until the indexing is 
> correct.
>
> If it's a newer Deore without the adjuster on the derailer you can use the 
> one at the shifter. Which I find super annoying so I don't buy those kind 
> so I don't know which way to turn it, but you'll figure it out after a few 
> turns this way and that. Good luck! 
>
> On Sunday, February 27, 2022 at 6:59:34 PM UTC-8 rmro...@gmail.com wrote:
>
>> I cannot answer your question but I am having a similar problem on my 
>> Clem with a Deore rear mech. I suspect cable stretch on this new bike?
>>
>> Sent from my iPhone
>>
>> On Feb 27, 2022, at 7:10 PM, Drw <drewbe...@gmail.com> wrote:
>>
>> Ok, so I had a rapid rise derailler around and all this talk from 
>> rivendell got me to put it on my partner's bike that i'm building up. I 
>> can't for the life of me get it to index correctly. Not saying the 
>> derailler is the problem, but i've never had this issue with regular pull 
>> deraillers, so im wondering if i'm missing something.
>>
>>
>> *Components:*
>> Rivendell Platypus 
>> Microshift 9 speed thumb shifter for shimano (new)
>> 9 speed shimano cassette (not new but good shape)
>> Deore LX rapid rise derailer (not new but good shape)
>>
>>
>> *Specific symptoms:*
>> -Can tune it to get the highs and lows, but the middle 2-3 gears get it 
>> jumping all over and not engaging with the cassette. 
>>
>> Any thoughts would be appreciated,
>> Drew. LA
>>
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