So I am getting parts together for my recently aquired xs buck shaver and it occurs to me that I don't know much about the various flavors of xt components. This is probably due to the fact that I went to XTR as soon as it was available. The last xt group I was familiar with was m735 which if my memory serves me was seven speed and thumbies.
Given the rapidly rising prices of vintage XTR and the fact that this bike is for my daughter I think the budget will be more towards 8 speed XT on this build. So my question is this. What are the technical and functional differences between the m737, m738 and m739 groups?
I am mostly concerned with the derailleurs, cassettes, cranks, and other drivetrain bits. I already have hubs. I would like compact drive and a mid cage rear derailleur if possible to keep the weight down. I may also upsell myself to an xtr cassette as I really think they are far better than anything beneath them. The bike will probably be gripshifted because that is what she is used to.
Thanks In Advance
I would also consider a sram setup if it was 8 speed and gripshift and compact drive, but honestly i know basically nothing about sram deraillleurs.
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