I've used both and as Patrick inferred the Periscopa probably wasn't 
designed for singletrack use. If it's for a mellower ride it will be fine. 

On Friday, September 26, 2025 at 9:51:38 AM UTC-7 [email protected] 
wrote:

> hi, all.
>
> there is a family of stems referred to as the "dirt drop", usually 
> designated with MT-10 or MT-10DX (i think the DX indicates a duller silver 
> finish vs a shinier silver finish).
>
> there is a separate family of stems referred to as the "periscopa", 
> sometimes designated with FU-82 or FU-82DX.
>
> both famililes are "forged aluminum", according to the nitto catalog. 
> assuming i found a stem amongst them that seemed an appropriate size and 
> shape, why would i choose one family over the other? is there some 
> particular non-size non-money reason to avoid a periscopa? (in my 
> experience periscopa stems are cheaper, but not in a "lugged nitto vs soma 
> shotwell" way.)
>
> Yours,
> Thomas Lynn Skean
>
>

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