manitou steer tube any one replace one??

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manitou steer tube any one replace one??
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flag albertadiablo
Posted: Jul 6, 2008 at 20:27 Quote
well looking into buying some forks but what can i do if the steer tube is too short can you get another one if so where how much is it thanks
flag markbatt
Posted: Jul 6, 2008 at 20:31 Quote
You cant do anything about it. if your lucky, you can send it back to manitou and have them press a new one in for you, but it will cost upwards of 100 bucks, which may not be worth it.
flag albertadiablo
Posted: Jul 6, 2008 at 20:40 Quote
if that is all there is to it to press the old one out and put a new one in thats nothing.if they cant get me one or replace it ill make one on the lathe and press it in myself lol done it with lots of crotch rockets
flag jonbikes
Posted: Jul 7, 2008 at 5:56 Quote
If it has a bolt on crown(s) you simply could find a steerer/crown assembly used that is longer and buy it. Other than that, if it is press fit into the crown and the crown is not bolt on, you would need to buy the whole new stanchion/crown/steerer assembly, which could get pricey. Then again, you could try doing it yourself like you stated, although I'm not sure how well that would go.
flag markbatt
Posted: Jul 7, 2008 at 9:50 Quote
albertadiablo wrote:
if that is all there is to it to press the old one out and put a new one in thats nothing.if they cant get me one or replace it ill make one on the lathe and press it in myself lol done it with lots of crotch rockets

Its not quite that simple. You see, the tollerances are so close between the outer diameter of the steerer tube and the inner diameter of the crown that the crown has to be super heated, and the steerer tube, cooled to a relatively low temperature. at this point, they are pressed in. Depending on the fork model and the shape/type of aluminum used on the crown, the crown may not have the integrity to have a new steerer pressed in.

All in all, dont try this one on your own. The possiblity for error is just too high to not have a professional do this.

~Mark
flag Borgschulze
Posted: Jul 7, 2008 at 9:58 Quote
Probably break the crown if you tried to press out the old steerer.
flag XCBiggles
Posted: May 8, 2017 at 8:49 Quote
[Quote="markbatt"]
albertadiablo wrote:
the tollerances are so close between the outer diameter of the steerer tube and the inner diameter of the crown that the crown has to be super heated, and the steerer tube, cooled to a relatively low temperature.

~Mark

I know this is an old post.... But i found it as i'm doing the same thing at the minute to change a 1.5" steerer to a 1 1/8" i had to just say this is a bit of a misconception. When a metal is heated it expands in all directions... the hole in the crown actually gets smaller in this case. Sticking the new steerer in the freezer over night will make it contract in all directions though and it will be easier to press in.

Anyway...

Did it work? Did you have a go?
flag Duderz7
Posted: May 9, 2017 at 6:09 Quote
Sounds like a great way to lose some teeth. The equipment and procedures used to accomplish this task are not likely available in most people's garages. If you have access to a well equipped machine shop maybe, but even then I would start with getting information from the MFR on the exact procedure as specific metal composition, glues, and temperatures could play a role. Any error could mean catastrophic failure. Having your front fork suddenly leave your bike is not a nice surprise, unfortunately I know from experience.
flag XCBiggles
Posted: Apr 12, 2018 at 13:28 Quote
Duderz7 wrote:
Having your front fork suddenly leave your bike is not a nice surprise, unfortunately I know from experience.

Tell us more, sounds like erm....'fun''' erm.....
flag Duderz7
Posted: Apr 12, 2018 at 23:04 Quote
XCBiggles wrote:
Duderz7 wrote:
Having your front fork suddenly leave your bike is not a nice surprise, unfortunately I know from experience.

Tell us more, sounds like erm....'fun''' erm.....
Due to legalities after the lawsuit I cannot say who made said fork. However it was a linkage fork from the mid 90's with a chromoly steel lower. The rear suspension design by the same guy is still one of the most popular today. The brackets for the linkage we're poorly welded to the lower assembly. After the break you could see the left over welding rod inside the tubes where they puddle welded the tubes backup after blowing holes through the tubes. Everything was then ground smooth from the outside to make it appear there was no issue. I've got 3 false teeth to show for it and scar tissue in my upper lip.
flag muddytreker
Posted: Apr 14, 2018 at 9:45 Quote
Fork steerers are pressed in, much like headset cups, though forced
in to a smaller hole, making a tight hold that's it,
no super heating glowing red hot metal involved.


How It's Made - Mountain Bike Suspension
https://www.youtube.com/watch?v=oaZtVskNdrM
flag RodneyPierce
Posted: Apr 14, 2018 at 9:55 Quote
muddytreker wrote:
Fork steerers are pressed in, much like headset cups, though forced
in to a smaller hole, making a tight hold that's it,
no super heating glowing red hot metal involved.


How It's Made - Mountain Bike Suspension
https://www.youtube.com/watch?v=oaZtVskNdrM

I agree with this, but you would also know that metal deforms once pressed together. So unless you source an oversize steerer tube (good luck unless you have one machined) then I wouldnt suggest replacing the steerer tube on a Manitou fork. Buy the entire CSA.
flag muddytreker
Posted: Apr 14, 2018 at 10:39 Quote
I should've added, I wasn't claiming to get a new steerer pressed in,
more on how they are fitted in production.

In answer to OP, buy a fork with sufficient steerer length for your
frame headtube, headset, stem etc

Though if you already have a fork and the steerer is to short then
there are steerer extenders available, but can look a little odd
depending on which type.
Some custom made ones can be had that insert into the steerer and bolted
down via a deep set star nut, and have a thread on the extender
for the top cap to press down the bearings.

Or a new CSU to suit your year and model fork.
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