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I recently asked in the Disc thread. Depends on your budget really - Ive now got a Topeak Pressurite and a Silca adapter.
http://www.sjscycles.co.uk/mobile/topeak-topeak-pressure-rite-presta-prod33474/
http://www.sjscycles.co.uk/mobile/silca-disc-wheel-adapter-prod23401/The best ones properly lock onto the valve, like the Hirame adapter, but £££
http://www.amazon.co.uk/KUWAHARA-HIRAME-Pump-Head-Yoko/dp/B003EIIXSG
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like the Hirame adapter, but £££
That's why the knock-off ones are so popular, although if the genuine ones had UK distribution they'd be much closer in price, Alex's charges about £35 for a real one but you get killed by the shipping+VAT+duty if you're buying just one.
Where's the thread where people decided on the best 90 degree valve adapter? I need one for the pump, the FFWD one off wiggle arrived and was promptly packed up again to return...!
Or, what's the best value 90 degree valve adapter?