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t1mmy




Joined: 22 Oct 2014
Posts: 95

PostPosted: Thu Mar 16, 2017 8:14 pm    Post subject: New tubs questions Reply with quote

Before i part with my hard earned money I wanted to check something with you lot.

I've got a set of Planet X 82mm tubular wheels and I need to change the tyres.

I'm looking at Continental GP 4000's - http://www.wiggle.co.uk/continental-grand-prix-4000s-ii-tubular-tyre/

On Continental's website it says all tubs come with removable 42mm presta valves - http://www.conti-tyres.co.uk/road-and-track/tubulars

I know I need to get valve extenders and I was thinking 60mm ones should do the job - http://www.wiggle.co.uk/continental-valve-extensions/

Can anyone confirm my thinking is correct? i.e. 42mm removable core + 60mm extension will be ok?

Also, I'm assuming that I'll remove the 42mm bit from the tub, screw it into the end of the extender then screw the whole lot back onto the tub?

Thanks for your thoughts
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Jorgan




Joined: 12 Nov 2007
Posts: 16315
Location: alles was ich bin, alles was ich war

PostPosted: Thu Mar 16, 2017 8:43 pm    Post subject: Reply with quote

I don't have any Conti tubs, but the selection I have, the stem is generally around 32mm long not including the removable core. So the Contis are likely 42mm with the core included. So circa 32mm plus 60mm should be fine, plus the core on top of that. I use PTFE tape between the stems.
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t1mmy




Joined: 22 Oct 2014
Posts: 95

PostPosted: Thu Mar 16, 2017 9:04 pm    Post subject: Reply with quote

Cheers Jorgan
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TriSam




Joined: 26 Aug 2011
Posts: 1166
Location: Tunbridge Wells

PostPosted: Thu Mar 16, 2017 9:05 pm    Post subject: Reply with quote

Won't you already have a valve extender in there?
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t1mmy




Joined: 22 Oct 2014
Posts: 95

PostPosted: Thu Mar 16, 2017 9:09 pm    Post subject: Reply with quote

The wheels came with Vittoria tubs on them with 36mm extenders. That means between the end of the extender and the tyre is a bit of a mystery. For the sake of 10 I'm happy to start a fresh.
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SGreg




Joined: 30 Jun 2010
Posts: 851
Location: High Peak

PostPosted: Fri Mar 17, 2017 10:10 am    Post subject: Re: New tubs questions Reply with quote

t1mmy wrote:

I'm looking at Continental GP 4000's - http://www.wiggle.co.uk/continental-grand-prix-4000s-ii-tubular-tyre/




Wow they are errrmmm not cheap !
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SwimsLikeAWalrus




Joined: 30 Apr 2007
Posts: 1476

PostPosted: Mon Mar 20, 2017 4:19 pm    Post subject: Re: New tubs questions Reply with quote

SGreg wrote:
t1mmy wrote:

I'm looking at Continental GP 4000's - http://www.wiggle.co.uk/continental-grand-prix-4000s-ii-tubular-tyre/




Wow they are errrmmm not cheap !


I managed to puncture one putting it on. I've left it in absolute disgust...
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Tin Pot




Joined: 08 Jul 2013
Posts: 2242
Location: Bromley

PostPosted: Mon Mar 20, 2017 5:51 pm    Post subject: Reply with quote

You want Vittoria Corsa Speed don't you?

When you try to touch them your hand just glides away. Pretty low rolling resistance...
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SGreg




Joined: 30 Jun 2010
Posts: 851
Location: High Peak

PostPosted: Tue Mar 21, 2017 9:50 am    Post subject: Reply with quote

I've always used Vittoria Evo CX .....currently 20 from PX

Seen me round 4 IM courses without issue.....well they nearly fell off in Nice but that's because the 30+DegC melted the glue I'm sure that would have happened to any tub.
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Jorgan




Joined: 12 Nov 2007
Posts: 16315
Location: alles was ich bin, alles was ich war

PostPosted: Tue Mar 21, 2017 10:35 am    Post subject: Reply with quote

SGreg wrote:
I've always used Vittoria Evo CX .....currently 20 from PX

Seen me round 4 IM courses without issue.....well they nearly fell off in Nice but that's because the 30+DegC melted the glue I'm sure that would have happened to any tub.


Really? I've raced in temps up to 40 degrees without any issue with Jantex tape (old old & new types). I would have though mastic would be even better. What sort of pressure are you putting in them?

I have a few old Corsa CXs, I find they wear pretty quicky though, compared to more modern offerings. Currently using Zip SLSpeed 24mm tubs (basically Vittorias still iirc).
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SGreg




Joined: 30 Jun 2010
Posts: 851
Location: High Peak

PostPosted: Tue Mar 21, 2017 11:20 am    Post subject: Reply with quote

Well It was Janex Tape come to think of it.

I think it was a combination of the high heat and the extreme* cornering in Nice, the descent is a long series of switch backs the heat must have softened the tape and then the continuous force of cornering just rolled the tyre round in the rim.


I didn't actually notice it until inspecting the bike afterwards and saw the tyres partially rolled around on the rim!


Yeah the CX's do wear fast. I seem to need a new pair every season. This always put me off higher priced tubs as I couldn't stomach replacing those so often. But at 20-30 it not too painful....

Looks like they are selling off stock now though and there will be no more
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flyingelephant




Joined: 22 Mar 2004
Posts: 5370
Location: Deepest Darkest Devon / Kn0b freezing Norway

PostPosted: Mon Apr 03, 2017 1:55 am    Post subject: Reply with quote

Always glue. Even raced without glue, just the unclean sticky #@?# thats left on the rim. Never had a tub move a mm on the rim. Lucky, life begins on the edge of your comfort zone
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explorerJC




Joined: 20 Oct 2005
Posts: 14649
Location: Farthingstone

PostPosted: Mon Apr 03, 2017 7:29 am    Post subject: Reply with quote

flyingelephant wrote:
Always glue. Even raced without glue, just the unclean sticky #@?# thats left on the rim. Never had a tub move a mm on the rim. Lucky, life begins on the edge of your comfort zone


yep....i tend to over glue, but have finished races on spares held in place with little more than pressure and hope....
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