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View Full Version : Pics needed of front brake cable through stem


clweed
11-10-2011, 02:49 PM
Does anyone have pictures of the brake cable running through the stem for Cantilever brakes. I'm curious to see how you did it. Over the bar or under the bar

Lee

christian
11-10-2011, 02:52 PM
Road bar or riser/flat bar?

clweed
11-10-2011, 03:08 PM
Road bar or riser/flat bar?

Road bar

christian
11-10-2011, 03:13 PM
If under-the-tape routing, I find the best option is:

Exit the tape at the bottom of the bar, then route along the bar and in front of the bar in a gentle loop, then entering the stem. You'll end up with a small loop in front of the opposite side of the bar, but it makes for the gentlest bend. Any other routing makes for too tight a turn.

Sorry, don't have any pics. Other option is obviously non-aero brakes, but I don't think you're going there.

christian
11-10-2011, 03:16 PM
Like this, but longer, swoopier loop.

http://3.bp.blogspot.com/_OWkJxRRH1R4/SGKh-uO4TII/AAAAAAAAAKA/ZuhQFccOiwY/s1600/Cable_thru_stem.jpg

clweed
11-10-2011, 03:20 PM
Like this, but longer, swoopier loop.

http://3.bp.blogspot.com/_OWkJxRRH1R4/SGKh-uO4TII/AAAAAAAAAKA/ZuhQFccOiwY/s1600/Cable_thru_stem.jpg

Thanks for the pic, this may work (without the hanger) if it will fit in the stem

reidbeloni
11-10-2011, 03:37 PM
I have a bit of experience. I did this for an IF of mine where I wanted to minimize spacers under the stem. I would start with a rather beefy stem, don't use ultra light aluminum ext. Steel might be best. I have used this aluminum bontrager race x lite 130mm -7 degree stem for 4 + years of cyclocross racing and haven't seen any changes in stem performance or any crack development. I am fairly confident that this maneuver is low risk. Though manufacture it carefully and check it regularly to be safe.

Start with your stem mounted on the steer tube, and mark the line along which your brake cable will run. Choose a virtual line through the stem that is also in line with the position of your brake straddle cable. Making this alignment correctly will prevent your brake cable from rubbing on the stem during brake cable pull or regular use. Mark that line on the top and bottom of the stem along it center line. You can see the whole set up and image the line I am talking about in image 1.

Using a drill press, drill a hole in the under side of the stem which is large enough for the brake cable. I missed the first time and ended up with two lower holes. Still no problem after 4 years. See image 2

The upper hole should be larger, large enough to accommodate a hydraulic to mechanical brake cable stop spacer. On a mountain bike cable stop/guide which was made for running hydraulic lines, the hydraulic lines bigger than mechanical housing. The spacer fits into the hydraulic guide and allows for traditional cable housing. Drill your lower hole to fit this part. You are using this part so that the brake cable housing sits recessed in the stem. This improves cable routing direction. You can see this spacer and the larger hole in image 3.

Ready to rock and roll.

http://filebox.vt.edu/users/rbeloni/sale/stem%11.jpg
http://filebox.vt.edu/users/rbeloni/sale/stem%202.jpg
http://filebox.vt.edu/users/rbeloni/sale/stem%203.jpg

reidbeloni
11-10-2011, 03:43 PM
I have a bit of experience. I did this for an IF of mine where I wanted to minimize spacers under the stem. I would start with a rather beefy stem, don't use ultra light aluminum ext. Steel might be best. I have used this aluminum bontrager race x lite 130mm -7 degree stem for 4 + years of cyclocross racing and haven't seen any changes in stem performance or any crack development. I am fairly confident that this maneuver is low risk. Though manufacture it carefully and check it regularly to be safe.

Start with your stem mounted on the steer tube, and mark the line along which your brake cable will run. Choose a virtual line through the stem that is also in line with the position of your brake straddle cable. Making this alignment correctly will prevent your brake cable from rubbing on the stem during brake cable pull or regular use. Mark that line on the top and bottom of the stem along it center line. You can see the whole set up and image the line I am talking about in image 1.

Using a drill press, drill a hole in the under side of the stem which is large enough for the brake cable. I missed the first time and ended up with two lower holes. Still no problem after 4 years. See image 2

The upper hole should be larger, large enough to accommodate a hydraulic to mechanical brake cable stop spacer. On a mountain bike cable stop/guide which was made for running hydraulic lines, the hydraulic lines bigger than mechanical housing. The spacer fits into the hydraulic guide and allows for traditional cable housing. Drill your lower hole to fit this part. You are using this part so that the brake cable housing sits recessed in the stem. This improves cable routing direction. You can see this spacer and the larger hole in image 3.

Ready to rock and roll.

http://filebox.vt.edu/users/rbeloni/sale/stem11.jpg
http://filebox.vt.edu/users/rbeloni/sale/stem%202.jpg
http://filebox.vt.edu/users/rbeloni/sale/stem%203.jpg

clweed
11-10-2011, 03:49 PM
Reidbeloni,

Cool, do you have a picture of the bars wrapped and the cable loop that you ended up with.thanks,

Lee

christian
11-10-2011, 03:55 PM
A v-brake noodle in the stem can help with routing the cable, too.

mdw617
11-10-2011, 03:57 PM
I don't have a photo but on my last CCX I took the housing over the top of the stem and came down the right side of the stem to the hanger. The radius of the bend was very gradual and worked very well. If I can find a photo I'll post it. No modification to the stem was required.

Kirk Pacenti
11-11-2011, 07:01 AM
This is the best solution I've seen in a while.

http://www.ritcheylogic.com/dyn_prodfamily.php?k=394971

rwsaunders
11-11-2011, 12:40 PM
Some stemmage from Signal and Vanilla...

Gummee
11-11-2011, 01:54 PM
Amazing how what was once passe is back in style...

IDK how many of y'all remember the first mtn stems, but I do. The holes in the stem went out of fashion with v-brakes. Now they're back cause of cross!

M

Smiley
11-12-2011, 07:24 AM
I am diggin the project more and more as I see you progress in the build. Smiley