Jump to content

Sign in to follow this  
bondy

sprocket bolts

Recommended Posts

hello as any 1 had problems with the rear sprocket bolts? i just got a new s3 sprocket and the bolts stick out to much there is a shallow recess not counter sunk any ideas what bolts i can use? i do have domed bolts but not sure if they will catch the S/Arm 

Share this post


Link to post
Share on other sites

Just dealt with this.  No countersunk sprockets in 40t.  Only counterbored.  Considered swapping from flush head / countersunk style to the counterbored shallow dome stle heads.

The Scorpa swingarm to bolthead clearance was pretty tight, and the countebored sprocket and that style bolt was marginal if any clearance.

Ultimately, I countersunk the counterbored sprocket and used the original flush head bolts.

Catch a look at the recent topic where I installed the Jitsie snails and 40t rear sprocket.

Share this post


Link to post
Share on other sites

i was thinking about using a counter sunk drill bit and doing the same as you using the original counter sunk bolts but i don't want to weaken the holes i have found some  domed bolts that are shallow and high tensil i know there's not much space between the sprocket and S/Arm i will test the bolts before making a decision.

Share this post


Link to post
Share on other sites

To properly countersink the holes, you must use a countersink in the drill press or milling machine.  The countersink angle must match or the sprocket will work as you accellerate or decellerate, ultimatley ruining the hub.

Share this post


Link to post
Share on other sites

looks like ill have to do this as there's not enough clearance between the sprocket and S/Arm :rolleyes:

Share this post


Link to post
Share on other sites

The countersink cutters angle must match the bolt heads angle, otherwise there will be only a small ring of surface contact between the bolts head and countersunk hole in the sprocket.

You mentioned using a drill to accomplish countersinking the sprocket.  Most drill bits are an angle of 118 degres and some being 135 degrees, but other odd angles may exist.

Countersinks come in various angles also, typically 60, 82, 90, 100, 120 degree cutting angles.  Pretty certain the proper cutter angle was 90 degrees, but did not run to the toolbox and check.

Share this post


Link to post
Share on other sites

Hello PMK I've sorted the New S3 rear sprocket i did what you have done countersunk the holes fits perfect now the New gold and black chain is also on and looks very tidy:thumbup:

Share this post


Link to post
Share on other sites

When are you planning to share photos of this masterpiece?????????

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×