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PostPosted: Sun Jul 19, 2009 3:30 pm 
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I'm about to order the Big Bundle Of Parts for my Lava Dome drop bar conversion. The bike is an '88-89 and has a 1" threaded steerer that I want converting to 1 1/8" threaded. NO! BAD FROGGY! I MEANT CONVERT TO 1 1/8 AHEAD, NOT THREADED! Ideally I'd like to use a converter that is also an extender so that I can play with bar height a bit and then cut the extender down.

Does anyone know if either of the gizmos here is what I want?

http://www.dotbike.com/ProductsP4016.aspx

Or other suggestions?

For the rest of the build I've decided to go with bar end shifters for their reliability and flexibility, and either Salsa Bell Laps or Bontrager Variable Radius Race bars in 46cm. I'd also appreciate suggestions/comments on brake cable - is it worth spending on XT/XTR/Gore ?


Last edited by PurpleFrog on Sun Jul 19, 2009 4:59 pm, edited 1 time in total.

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PostPosted: Sun Jul 19, 2009 3:58 pm 
B.o.T.M. Winner / Feature Bike
B.o.T.M. Winner / Feature Bike
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PurpleFrog wrote:
The bike is an '88-89 and has a 1" threaded steerer that I want converting to 1 1/8" threaded.


Very much doubt that there is anything out there that would do that. You can convert to 1 1/8" ahead, but not threaded. Try looking for a high rise 1" stem like the nitto dirt drop stem like this:

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0331986563

rather than bolting all manner of adapters and shims together. Also make sure that you get a set of bars that match the stem bore, ie 25.4mm or 26.0mm. Personally if you are going for drops then I would avoid road bars and go for something like the on-one flared drops or wtb ones


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PostPosted: Sun Jul 19, 2009 4:58 pm 
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pete_mcc wrote:
PurpleFrog wrote:
The bike is an '88-89 and has a 1" threaded steerer that I want converting to 1 1/8" threaded.


Very much doubt that there is anything out there that would do that. You can convert to 1 1/8" ahead, but not threaded. Try looking for a high rise 1" stem like the nitto dirt drop stem like this:


ARGGH! I should have said convert oto AHEAD, NOT THREADED!

And I don't want wtbs - they're great for hardcore offroading but I want a versatile crosser with the full range of drop hand positions, but that thanks.


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PostPosted: Sun Jul 19, 2009 6:04 pm 
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Joined: Tue Nov 18, 2008 10:49 am
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You can't go from 1" to 1 1/8" without serious surgery on your frame, it's the size of your bike's head tube that determines which fork you can use. You could go from 1" threaded to 1" threadless with a new fork, but if it ain't broke, no need to fix it. There's no real advantage with threaded vs threadless, except it makes it cheaper for the manufacturers to produce forks.
You need to work out which size your bars clamp diameter is, then choose either a road stem or stick with the stem you have.
And as for cables, they're a disposable item. No need to go looking for the perfect one, performance increases are down to getting the lengths right.


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PostPosted: Sun Jul 19, 2009 7:06 pm 
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If you really want to convert to 1 1/8" you would have to cut off the existing head tube and weld on a new one. There's no reason why anyone would do that. If you want to run an ahead stem there's two options: get a steerer extender like the one in your link or get a threadless fork and replace the headset for a threadless one. In both cases, you can use an ahead stem made to clamp onto 1 1/8" steerers, but you need a shim to go around the steerer.


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PostPosted: Sun Jul 19, 2009 8:27 pm 
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Ok, I've written a REALLY bad OP. Try again:

- I want to keep the fork (a Kona Project [b]One
- I'd probably be hit with a Preservation Order if I tried to get rid of them and anyway, I like them)

- But I want to mate it to a stem that will take either 26mm or OS handlebats. Bars. I mean handlebars.

- Said stems are only interested in relations with 1 1/8" ahead steerers, so I need to convert

- But I may need a bit of extra height.
[/b]

I've made a mess of this, haven't I!


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PostPosted: Sun Jul 19, 2009 8:32 pm 
retrobike rider / Gold Trader
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You'll want a threaded to A-head converter then, something like this one:

http://www.sjscycles.co.uk/product-Unbr ... r-3063.htm

There are loads out there.


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PostPosted: Mon Jul 20, 2009 2:48 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
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Location: New Forest, UK
I've done exactly the conversion you say, using a Deda ahead converter. You also get about 50mm or so of vertical adjustment.


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PostPosted: Mon Jul 20, 2009 2:53 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
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grrr


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