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@Ordinata
I've got an s3x on my fixeh, as far as I know so has Tilover?
I have enjoyed the range of gears as it has allowed me to use a much higher GI and still cope with moderate inclines.
I would say the mechanical loss is its main disadvantage, even though this is not massive in planetary systems it still saps your energy to the point that you feel it.
I am using a bar end shifter to select the gears and even with getting used to not pedalling while changing it has become a bit fiddly to find the gear.
The other problem that I have had is the cable has stretched through use, as the shift to the lowest GI is quite tough. This inturn has proved dangerous as the gear pin has bounced out under power. (I have been flat on my back infront of a queue of traffic after trying to pull out of a junction because of this)
I stripped and checked the gearbox over after the incident and could not see any damage so I assume it is cable stretch, (although I have read after breaking in you should tighten the axle collar bolts if there is play which I did after reassembly) it is pretty heavy tool steel construction, but the selector pin is very small in comparison.
If they could make the gear change alot more positive, ie. like a motorbike gearbox, I believe it could be very good.
It is a lot of fun tho.