1) Will still allow me to inject sealant by the road if needed
2) Not too long, but sufficuent to get the pump on
4) Black preferred but not essential
Give me your knowledge to imbibe WW!
The good part about the zipps is that they have a grey rubber cover on the shaft which elliminates valve rattle.
vittoria ones are available in black, make sure you get normal presta extenders not vittoria's old proprietary ones, these are fine...
http://www.ribblecycles.co.uk/vittoria- ... sions-2pcs
... they also include a nice metal core tool, much better than the plastic ones
do them up *tight* when fitting, a bit of ptfe tape will help give a tighter fit, then you can use the core tool to take the valve out if you need to squirt some sealant in on the road
tufo extreme works very well with veloflex, about a quarter of a bottle is usually enough
carry something you can use to push through the narrow hole of the extender as the tufo can easily seal it, i use a bit of plastic coated wire
Silca: black with anti rattling rubber, brilliant. They come in different lenghts.
I used at some point, Token or BBB extenders. The valve core was going a bit dipper into the shaft, not leaving enough exposed thread on the core. Having screw on pump head it wasn't ideal.
All of them are for removable valve core (friendly for sealant injections).
So complete amateur question, but I'm new to tubs and having to maybe use sealant...the Veloflex core comes out, the Vittoria extender (which I assume has a removable core in it) goes on and we're good to glue?
Do you think a 30mm extender would be enough? That should leave about 20mm sticking through the rim. I can't stand long unsightly valves! Spose I could just chuck a standard extender on the Vittoria extender while inflating if it was a touch short for the pump head...
fwiw with 47.5 rim depth a 30mm extender is fine, there's a 'normal' amount of stem projecting to get a pump on, not excessive
the lightweight extenders are 30mm, tbh i prefer the vittoria ones for the better core tool
you take the valve out of the tyre stem and screw the extender onto the stem, then put the valve from the tyre into the end of the extender, i.e. you can always reach the valve with this type of extender
to inject sealant you only remove the valve
in the event you accidentally unscrew the extender once the tub is glued, it's not the end of the world, even out on the road you just use your fingers to press the valve seat 'into' the rim and then screw the extender back in using fingers, it'll seal well enough (once home, inflate hard then use pliers to tighten it a bit)