Need help with stem: current bike vs. new build

[Hai H. Ho]

I just purchased a used Klein Quantum Pro f & f and need to confirm the new stem length and angle to best replicate what is dialed in on the current bike.

Current bike has D/A while new build will have Campy Record.

Thanks for the help and wealth of knowledge.

Current Bike:
2007 Look 595 Medium.
Effective Top Tube:54.5cm
Head Tube:14.8 cm
Cut Steer Tube Length: 21 cm
Chain Stay:40.5 cm
Seat Tube Angle: 73.75 deg and Heat Tube Angle:73.0 deg.
Current stem:Syntace F119 84/6 degree 100 mm
Current bars: Syntace Racelite 31.8 bars with a 112 mm reach.
Group: Dura Ace 7800
Current Saddle: SLR leather
Saddle seatback:70
Center of bb to top of saddle: 71.5
Saddle tip to center of bar at stem: 51.5cm

New Build
1999 Klein Quantum Pro with Thomson Elite Post with no seat back.
Top Tube: 54.2cm
Head Tube:11.5cm
Cut Steer Tube Length: 19 cm
Chain Stay is 41.4cm
Seat Tube Angle: 74.0 deg and Heat Tube Angle: 72.7 deg.
Desired Stem: Thomson Elite X4 with shim since steer tube is 1 1/16th What length and angle should I get?
New Bars: Same Syntace Racelite with 112 reach.
Group: 2006 Campy Record 10-Speed
New Saddle: Carbon SLR, same length

[Dave]

Not the right info. The head tube length is needed, but the other critical item is the headset stack height and the amount of spacer under the stem. IIRC, that year of 595 still used an IS heasdset with a 15mm top section. I know nothing about the Klein's headset.

Just going by the cut steering tube length that is 2cm shorter on the Klein, you'll need a 96 (+6) degree stem to raise the bars about 2cm. The horizontal stem length needed would be the same, since the slightly steeper STA adds 2-3mm of reach. With a flipped stem, that means it must be one size longer, or 110mm, to get about the same horizontal length.

Yout won't be able to get the saddle nose setback 70mm with a nonsetback post and a 74 degree STA, with that saddle height. I'd say 25mm minimum, more likely 32mm. I have about the same setback on the 51cm LOOK 585. The STA is steeper, but my saddle height is taller and that makes up the difference. I used an SLR for awhile this year. A 32mm setback FSA seatpost was perfect.

[TimD]

http://www.bikeforest.com/CAD/index.php

Enter both and vary the stem parameters on the new article until you are happy.

[Hai H. Ho]

[QUOTE=Dave]Not the right info. The head tube length is needed, but the other critical item is the headset stack height and the amount of spacer under the stem. IIRC, that year of 595 still used an IS heasdset with a 15mm top section. I know nothing about the Klein's headset.

QUOTE]

I remeasured a few things and was off on the current bike.

Look 595:
Cut Steer Tube Length: approx. 23 cm, which includes 14.8 cm head tube, 1.5 cm for IS head set top section, 2.6 cm of spacers underneath stem, and 4cm stack height for Syntace stem.
Current stem: Syntace F119 84/6 degree 100 mm

New Build Klein Quantum Pro:
Cut Steer Tube Length: approx 19 cm, which includes 11.5 cm Head Tube, 1.0 cm for head set top section, 2.5 cm of spacers and 4cm for stem.

I've attached a picture for reference.

The stem I like is the Thomson Elite X4, but it only comes in 0 degress. I will consider the Elite X2 if the the +/- 10 or +/- 17 degrees will best replicate the current bike.

So which stem, size, and angle should I get?

Thanks for the help again Serotta Forum and happy holidays to everyone.

[Dave]

The Klein's stack length is about 4cm shorter than the LOOK you need a 73 (-17) degree stem, flipped to +17 in a 120mm length.

[CNY rider]

The Klein's stack length is about 4cm shorter than the LOOK you need a 73 (-17) degree stem, flipped to +17 in a 120mm length.


Aye carumba, what you really need is more head tube and a longer steerer.

[KJMUNC]

Aye carumba, what you really need is more head tube and a longer steerer.

....and while you're at it, send me both sets of your carbon wheels and I'll send you a frame that fits.

[John H.]

You may have multiple other setup issues that you have not considered.
1.) You will probably need a setback post to get the saddle in the same spot as your Look- the Klein has a steeper seat angle- I see that you sit 7cm behind the bb.
2.) Not only will you need to figure what rise/length stem will get the bars where you need them- you may have a hard time finding stems. The Klein (if it is a 1999) is not 11/8- they were a proprietary size 1 1/16?. So you will either need a Klein stem or you will need a shim to make 11/8 stems work.
If you go the shim route- contact me. I might have one in my parts bin.
I know that I have a Klein Specific stem- It is for 26.0 bars though.

[John H.]

I do have a Klein stem shim- unused- still in the package. PM me if you need it. With this shim you can use any 11/8 stem.

[soulspinner]

[QUOTE=Dave]Not the right info. The head tube length is needed, but the other critical item is the headset stack height and the amount of spacer under the stem. IIRC, that year of 595 still used an IS heasdset with a 15mm top section. I know nothing about the Klein's headset.

QUOTE]

I remeasured a few things and was off on the current bike.

Look 595:
Cut Steer Tube Length: approx. 23 cm, which includes 14.8 cm head tube, 1.5 cm for IS head set top section, 2.6 cm of spacers underneath stem, and 4cm stack height for Syntace stem.
Current stem: Syntace F119 84/6 degree 100 mm

New Build Klein Quantum Pro:
Cut Steer Tube Length: approx 19 cm, which includes 11.5 cm Head Tube, 1.0 cm for head set top section, 2.5 cm of spacers and 4cm for stem.

I've attached a picture for reference.

The stem I like is the Thomson Elite X4, but it only comes in 0 degress. I will consider the Elite X2 if the the +/- 10 or +/- 17 degrees will best replicate the current bike.

So which stem, size, and angle should I get?

Thanks for the help again Serotta Forum and happy holidays to everyone.

Bike slut :p

[John H.]

You may need an even shorter stem if you run the saddle at the same setback- steeper seat angle on Klein.

[jlwdm]

You may need an even shorter stem if you run the saddle at the same setback- steeper seat angle on Klein.


As Dave said though to get the same fit as bike one a setback post is necessary. Got to start with the saddle in the same position compared to BB.

Jeff

[avalonracing]

I hope that you can figure it out. I have a 2000 Quantum Race in the same color that I still ride. It has been a great bike.