I would think that you don't need cones if you have sealed bearings?
Rear track axle for sealed bearings: http://www.ebay.co.uk/itm/Rear-Hub-Axle-Hollow-Sealed-Bearing-MTB-Fixie-Single-Speed-10mm-135mm-116mm-/141876293157
Rear track axle for cone bearings: http://www.ebay.co.uk/itm/Front-or-Rear-solid-chromed-black-spindle-axle-8mm-9-5mm-singlespeed-rear-/360888087872 http://www.ebay.co.uk/itm/Cyclo-3-8-Rear-Hub-Axle-Spindle-single-speed-fixie-7497-/170484779745
But then again, if you need that many parts, you might prefer getting a new 'budget' rear hub and take parts from it or even relace the wheel.
Planet X has complete rear track hubs for £9.99 in 32h or 36h: http://www.planetx.co.uk/i/q/HUOOLF/on-one-large-flangetrack-hub
Planet X has complete rear track hubs for £9.99 in 32h or 36h: planetx.co.uk/i/q/HUOOLF/on-one-large-flangetrack-hub
Unfortunately not: despite the photo, if you check the description they only have front hubs.
I only know this because I was after a rear and nearly got suckered.
@Scilly.Suffolk started
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I would think that you don't need cones if you have sealed bearings?
Rear track axle for sealed bearings:
http://www.ebay.co.uk/itm/Rear-Hub-Axle-Hollow-Sealed-Bearing-MTB-Fixie-Single-Speed-10mm-135mm-116mm-/141876293157
Rear track axle for cone bearings:
http://www.ebay.co.uk/itm/Front-or-Rear-solid-chromed-black-spindle-axle-8mm-9-5mm-singlespeed-rear-/360888087872
http://www.ebay.co.uk/itm/Cyclo-3-8-Rear-Hub-Axle-Spindle-single-speed-fixie-7497-/170484779745
But then again, if you need that many parts, you might prefer getting a new 'budget' rear hub and take parts from it or even relace the wheel.
Planet X has complete rear track hubs for £9.99 in 32h or 36h:
http://www.planetx.co.uk/i/q/HUOOLF/on-one-large-flangetrack-hub