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ritchey road stem and carbon steerer compatibilty(7 posts)

ritchey road stem and carbon steerer compatibiltysilroadbike
Nov 2, 2002 9:47 PM
Help! I just had my Colnago CT1 built and the original ITM stem was too long so the builder had only one 8cm stem which is the ritchey road stem (he said it was the lowest end of the Ritchey road stem at $39). I want to know if the stem would be compatible with my colnago star carbon steerer. Also, should I buy a better quality road stem in 8 cm or does a road stem really make a big difference?

Thanks so much
Have a look inside of the stem ...Markus_B
Nov 3, 2002 5:19 AM
the smaller the hole the better for the steerer.

If I had a fork with a carbon steerer I would leave the steerer some mm longer and add a 5 mm spacer ABOVE the stem.
what?C-40
Nov 3, 2002 1:18 PM
The smaller the hole the better for the steerer??? What's that mean?

All Ritchey stems fit either 1" steerers with
the supplied bushing or 1-1/8" without the bushing.

The correct answer is that the Ritchey stem is fine for use with a carbon fiber steering tube.

Another appropriate question is did the builder give you back some money? The colnago stem is worth about $80 more than the Ritchey.

The final question is why so short a stem??
what?grzy
Nov 4, 2002 12:12 PM
Maybe he plays a midget on TV?!
101: StemsMarkus_B
Nov 4, 2002 4:41 PM
Certainly I'm not talking about the clamp size.

Assume a stem is composed of 3 components: a steerer clamp, a handlebars clamp and a tube inbetween - most stem have a hole at the inside where the steerer clamp meets the tube.

This hole may squeeze a carbon steerer, especially if the end of the steerer is NOT above the upper edge of the hole.

Thus I conclude: The smaller the hole the better for the steerer. Got me?
poor conclusion...C-40
Nov 4, 2002 7:40 PM
In plain english, you're talking about the hole through the stem extension that intersects the steering tube clamp.

The hole in the steering tube clamp will reduce the surface area in contact with the steering tube, but this area is reinforced with an internal expanding plug. The idea that this hole could lead to steering tube damage is nonsense. If a steering tube is going to get pinched, it will be along the split between the clamp bolts, not on the opposite side.

The steering tube should never be more than 3mm below the top of the stem. I've never seen a hole that close to the top of the steering tube clamp.

As long as you follow the recommended torque for the clamp bolts, there won't be a problem.
and more...C-40
Nov 4, 2002 7:44 PM
All Colnagos have 1" steering tubes, which require the use of the (supplied) reducer bushing. Once this bushing is in place, there is no hole in contact with the steering tube.