Retrobike Forum Index

It is currently Sat Dec 03, 2016 1:04 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 14 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: Sun May 15, 2011 4:50 pm 
Dirt Disciple

Joined: Thu Aug 05, 2010 9:58 am
Posts: 47
Location: TOKYO
This is my Klein Quantum Pro. I have had it a year and want to change to a modern short drop and reach handle bar.

Image

Also, I find a little bit too stretched on it (it's a 57cm frame and I usually ride a 56cm) so I want to change the stem to a 90mm from the current 100mm.

I did a lot of searching and heard that Klein did make a shim to fit 1 1/8th stems, but finding one after so long is proving impossible. I also saw that Reset Racing started making a shim. But after 2 months of emails, I have had no response.

So I did some calculations and figured I need to go from 1 1/16" = 26.9875mm to 1 1/8" = 28.575mm.

A difference of 1.5875mm so the shim will need to be 0.79375mm or 0.8mm.

I found this Cane Creek seat post shim that goes from 27.2 to 28.6mm, which is a diameter change of 1.4mm or 0.7mm shim thickness. As it is so close to the correct dimensions, it should slip on snugly and mate the 1 1/8th inch stem nicely to the Klein steerer. Hopefully the 0.1mm will be fine when the stem is tightened. I am planning to trim it down to size as it is surely too long.

Image

I also bought the new stem, a nice 3T Arx Pro that I have been seeing a lot of on the weight weenies forum. It is lightweight, looks nice and is pretty cheap, but comes in the size I want, 90mm with -17degree angle to have a parallel stem like I currently have.

Image

Finally, I bought some new bars, I would love to have gone for the 3T Carbon Ergonova, but budgets are tight at the moment, so i opted for a Deda RHM02 at 1/10th the cost, which have nearly identical shape and nicely flattened ergo tops at just 50g added weight. Also seem much stiffer than my current 25.6mm bars which should be named, sir flex-a-lot.

Image

And to top it all off, a cheap carbon top cap with 1 inch star nut.

Image

I am planning to pick up replacement carbon spacers once I have completed the operation, as I am not a fan of the chunky plastic spacers the MC2 has. I can give or auction away the unwanted old MC2 parts as I hear there is demand for them.

I have nearly everything I need for this little project accept for one vital thing. The MC2 tool. Luckily, one is flying to Tokyo from New York at this very moment. I posted on the Klein owners group in Facebook and someone is being kind enough to lend it to me. Shipping came to $5.60!!!

I will document the process to help future owners escape the evil that is the MC2 stem. It's a great design, but since it is no longer produced, when having to change the stem, it's a great proprietary problem.


Top
 Profile  
 
 Post subject:
PostPosted: Mon May 16, 2011 6:58 pm 
Retro Guru
User avatar

Joined: Tue Jun 19, 2007 10:27 pm
Posts: 860
Location: Hull
As much as you don't like the MC2 stem ...

... don't sell it!!! As you point out, very hard to replace, and you'll be filled with remorse if you ever have a change of heart or decide to sell the bike. Klein buyers wouldl almost certainly see the loss of the bike's original stem as a bad thing.


Top
 Profile  
 
 Post subject: Step 1
PostPosted: Sat May 21, 2011 10:57 am 
Dirt Disciple

Joined: Thu Aug 05, 2010 9:58 am
Posts: 47
Location: TOKYO
So the tool arrived in the post! Thanks Mark from New York for lending it to me!

Image

Step 1, Remove the MC2 stem.

This was pretty easy, put tool on and turn anti-clockwise. The silver top part spins, but is connected to the stem itself.

Image

When the stem is taken off, the collet will still be on the steerer tube, it was greasy, so I used a tissue when pulling it off.

Image

Now the Klein Spacers can be removed. Exposing the entire tube.

Image


Step 2, Make the shim.

Again, a simple task, I put the shim over the steerer and used some tape to mark where i want to cut.

Image

I then used a crappy hack saw and got a surprisingly straight cut. I then filed the bur off and removed any imperfections with the file also.

Image

Pretty nice fit.

Image

Step 3, Put the shim and new stem on.

Yawn... This is too easy, but the juicy fun part. As the Klein doesn't use a top cap to put pressure on the head set bearings, I can put the stem where I want on the stem and not use any spacers (but I will get some later).

Image
Shim could do with 0.2mm more thickness I think, but it's on very solid, so I guess it is within tolerance.

Image


Step 4, Prehensile Top cap install.

This is really just to stop water getting into the steerer and look nice. I was thinking of an expander plug, but star nuts are so cheap. I got 1 inch and 1 1/8th inch star nuts and checked which works better. The 1 inch one looks the best fit, so pop it in and hammer away!

Image

Image

I then measured the amount of empty un-spacered steerer and bought some carbon 1 1/8th spacers to fit, with a flared one at the bottom.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Sat May 21, 2011 3:17 pm 
Retrobike's #1 Comedy Genius
Retrobike's #1 Comedy Genius
User avatar

Joined: Thu Jan 04, 2007 8:07 pm
Posts: 4104
Location: Wolkenkuckucksheim
Sorted!!

I changed the forks on my Q to EC90s (standard stronglight h/set, so no hassles there, just changed it for a bbb aheadset)......luckily found the ITM Millenium stem which came with a shim for 1" steerers.

Them inline gear indicators ye've got?


Top
 Profile  
 
 Post subject:
PostPosted: Sun May 22, 2011 5:26 am 
Dirt Disciple

Joined: Thu Aug 05, 2010 9:58 am
Posts: 47
Location: TOKYO
Yeah, the right side is an in-line gear indicator. The left side is a barrel adjuster for fine tuning the front derailer.

Image

Here are some nice photos I took to celebrate a job well done after today's post rapture ride this morning.

Image

Image

Image

Image


Top
 Profile  
 
 Post subject: Update.
PostPosted: Sat May 28, 2011 7:29 am 
Dirt Disciple

Joined: Thu Aug 05, 2010 9:58 am
Posts: 47
Location: TOKYO
I decided to see if I could do something about the 0.2mm shim difference as the spacers had a slight bit of wiggle room.

I cut an aluminum can to make an extra single layer shim. It is now a perfect fit.

It is very tight and I think the double layer shim will hold solid.


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 01, 2011 10:13 am 
Retro Guru
User avatar

Joined: Tue Jul 27, 2010 11:54 am
Posts: 332
Location: Middlesbrough
Oh come on! Look at that pic with the city in the background, it could not get much more perfect it is like you live in the future (as envisioned in the 80s)!! :D


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 01, 2011 12:36 pm 
Dirt Disciple

Joined: Thu Aug 05, 2010 9:58 am
Posts: 47
Location: TOKYO
milko wrote:
Oh come on! Look at that pic with the city in the background, it could not get much more perfect it is like you live in the future (as envisioned in the 80s)!! :D


If you like that, you might like the view from my old apartment. And YES, when I ride around Tokyo at night, I do listen to the Tron soundtrack!

Image

Image

I'm going to have to go out and take more photos once the rainy season finishes!


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jun 03, 2011 9:05 am 
Devout Dirtbag
User avatar

Joined: Mon Aug 10, 2009 10:33 am
Posts: 103
Location: EHV, Netherlands
Wow, nice Klein and great pics!

That is Roppongi, right?


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jun 03, 2011 11:51 pm 
Dirt Disciple

Joined: Thu Aug 05, 2010 9:58 am
Posts: 47
Location: TOKYO
INDECS wrote:
Wow, nice Klein and great pics!

That is Roppongi, right?


No, sorry, it's Tamachi.

I don't like Roppongi. Shibuya is much better!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 14 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: fossala, originalshinkicker and 22 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group