Wednesday, 19 September 2012

Bish, Bash, Bosh!

Every once in a while (When you ride a bike) you're gonna come off or hit something.

That's a fact. There's an old saying about bikers - There's two types of bikers, those that have had a crash and those that are gonna.

Yesterday I managed to smack into the back of a car at a roundabout. I saw her move, looked right to see if the traffic was easy enough for me too, looked back to the front and she'd stopped.

Yeah, I know, heard the jokes about shop windows and stuff. It was my own dumb fault, but luckily All that happened to the bike was the footpeg got knocked off and the brake linkage got bent. I kept upright so there was minimal damage to me and the bike other than that and a sore leg.

As you can see, the bolt that holds the front footpeg was bent too much to save.
Not a great picture, but the threads all got stripped out of that hole in the footpeg bracket.

To fix it, I drilled out the hole to remove all the damaged material. (Make sure you don't drill a hole bigger than you have a bolt for).

Then, I measured the thread on my new bolt with a thread pitch guage.
See how the little teeth align perfectly with the valleys in the threads?

Now, since I know the bolt is a M10 and the thread is 1.5, I dug into my tap and die set for....a M10x1.5 Tap.  Simple, eh?

These kits cost about 20 to 30quid from somewhere like Amazon or Screwfix and they're well worth the money. You don't need the high end, expensive ones if you're just using them now and again on your own bike.

If you need a good one in a hurry, try this.

So, having cleaned out the old threads and selected the right tap, I added a little grease to it (Some folks use special cutting compound, but I never had any problems with plain old grease..The important thing is you use something, cos a dry tap in a dry hole will snap).
Here's a fuzzy pic of the thread cutting. This bit is really important, go slow, never more than half a turn inwards and always slack off a quarter turn each time. This snaps off the swarf inside the hole and lets the cutting faces unclog. If you try and go too fast, you'll break the tap in the hole, cut a wonky thread or bust the tap wrench. Either way, the part you are trying to save will be junk. So take it easy!

After cutting the thread, clean it out with some WD40 or something, then (finger tight) screw in the bolt a few times to make sure it runs in and out cleanly.

As you can see in the fuzzy pic above, I bolted everything back up and it works fine. Which is good, cos I'm too poor to pay a garage to do it.

See ya soon.



  1. Nice "how to." I've not used a tap and die set in years, however, I am certain my time is coming!

  2. Thanks mate! Hope you don't need the info for a while, but we all need a reminder now and then.