DIY: Screw Tires

Mar 4, 2008 at 11:44
by Janne Aspinen  
Do you ride in snow? Are you tired of bad traction in winter?
Are you willing to put some weight on your bike for a nice grip?
If so, you might be in need of the screw tires!

This article with pictures and video shows you a way to make your own
screw tires.Diy: Screw Tires

Where I live, in winter time screw tires are pretty much standard on DH
bikes. Some people use studded tires. Studs are good enough for some
conditions, but there isn't many occasions when studs gives better
traction than screw tires.

Last winter I did my first set of screw tires. I had pair of 2,3"
Continental Verticals, I mounted 105 pieces/wheel of 2.5mm x 15mm
Torx-screws on 'em. The pair have held up pretty well, although screws
were little bit too long to begin with.


1811330

1811330

My old screw tire.



I have had in my mind from the beginning of this ( 2007-2008 ) winter to make a tutorial
about screw tires. Recently I got pair of suitable tires so I was good
to go. So let's start!

Views: 7,377    Faves: 49    Comments: 25

For a taste of what is coming, here is my video about the process.



Check this page for info about choosing right tires and screws.
Then continue on.


Tools you need:
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1811356


-Drill
-Small drill tip (tip that is 1mm (0.039") smaller diameter than your screws)
-Suitable tip/tips for screws

Recommended extra

-Cardboard box for installing screws (I have found this is good way to
install screws. You can drill your screws through tire and cardboard box
and then you just pop tire out from box and continue. If you would do this
for example on wooden table, screws would allways try to mount themself to
table.

Making tires:

1. Drill guide holes to knobs

First step is to drill guide holes to knobs. Some people doesn't do this
step, but I recommend it. With guide holes it's easier/faster to install
screws and they hit more likely the very center of knob.

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1811404

Four guide holes already drilled, only 156 holes to go.


So you start drilling wanted knobs from outside in. You can check out what
kind of hole it leaves to inside of the tire. Try to make holes visible, so
you can find them later, take your time. I used quite a lot of rpm on drill
so it drills through nicely.

One tire with 160 holes took me 15 minutes.


2. Install screws to center knobs

Okay, we got guide holes done. Next we should install screws to center knobs.
Screws obviously will be installed from inside to out. At this point I'll
take out the cardboard box (check out. "Recommended extra"-topic). With it
you can install screws by using drill downwards.

Locate guide holes from inside of tires and install screws to the holes. Try
to install screws as middle of the knob as possible.

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1811349

It took me 20 minutes for 80 screws.


3. Install screws to side knobs

My Gazzaloddis had massive side knobs, so I decided to go with 4mm wide screws.
Thread on 4mm screw is so big, it will drill its way through rubber where ever
it wants to, so guide holes with these screws doesn't do much. Because of that,
I had to split this step in two.

3a. Preinstalling screws

First I installed every screw to their side knob's guide hole for only few
threads. Just so the screw stays there.

3b. Installing screws

Then I went through all screws and aimed them to center of the side knob one
at a time. This was quite laborious step to do.

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1811338

In all it took me 35 minutes for 80 side knob screws. Here my both tires
after 3 hours of work.



Okay, you got tires ready. Now you need extra inner tubes or other
ways to protect tubes from getting punctured by screws. I use double tubes:
one sliced Nokian DH-tube and one normal 2,3" tube per tire.
Best way to
slice tube is to do it with scissors, cut tube open from inside and don't forget
to cut valve out. Another way to protect tubes is to use duct tape.

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1811348

Screw tirem, sliced tube and clue.


As an extra measure I clued sliced tube to screw tire. It will help a little bit,
when changing punctured tube.

With double tubes you just slide normal tube inside of sliced one and install tire
normally. It's lot easier to install double tubes if your non-sliced tube is smaller
than your tires.

Last very important step is to put high pressure to tires: I recommend as high as
2.5 to 3 bars. It really sucks to change your tires in snow and cold...

Here some pictures of ready tires:

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1811336

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1811335

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1811325


Hopefully you liked this DIY article. I would really like to see comments and
conversation about this article. Thanks!



P.S. Here is something you may have seen. Screw tires makes this kind of speeds possible on snow.

EDIT: Here is my setup with new screw tires on.
EDIT2: More video: HelmetCam action on snow at Laajavuori.


19 Comments

  • + 3
 i made a set about two seasons ago and the traction was incredible. my buddies thought i was nuts until we hit a patch of ice under the snow and they wiped out, but i barely even noticed the ice at all. i didn't find much difference in snow over 3" (7-8cm.), but on ice, they are amazing. they are definately worth the effort to make and the extra weight on the bike.
excellent diy guide, very easy to follow, and fun video. good job
  • + 1
 This is a great how-to... One other thing that you can do if there is more ice/hardpack snow on the trails you ride, or if you ride a mix of trails/streets in winter, is to put washers on the outside and inside of the tire as you're putting the screws in. The washer helps pinch the rubber of the tire and make the screw hold better in the tire. I've got a set of winter tires that I've been running for 3 seasons that still work great (they're missing the points of the screws though). Also, don't forget some powder (baby or talcum) inside the tire when doubling the tubes so that the inside tube can spin freely.
  • + 1
 That might be a good idea. I have seen some ppl use small nuts and bolts. I think they are just much harder to install and it takes many times longer to do.
  • + 1
 I didn't had a change to weight them. I think it's about 2 kg/tire.
-Gazzaloddi 2,3" - approx 1100g
-Nokian 3" tube - approx 400g
-Kenda 2,3" tube - approx 150g
-13mm X 3mm screws x 80 - approx 120-150g
-15mm x 4mm screws x 80 - approx 180-250g
= 1950 - 2050g
  • + 1
 do you put them on the wheel bear handed or with thick gloves?
  • + 1
 I think I had some gloves. Screws are very sharp when they are new, so be careful.
  • + 1
 did this but i used self taping screw, and used only a 100- but i think im going to but ANOTHER 60 in to be safe, im notworring about the screw heads, cuz mine are fiald down and round head.
  • + 2
 That was helpful and well written. Not sure if U did mention something about the weight of the tires but I wasn't able to spot that, so please tell me how much?

Loistava homma.
  • + 2
 Best diy quide what i have ever seen. and that video, how i can say it.. its funny Big Grin
  • + 1
 Brilliant guide, will take advantage of this when visiting Lappeenranta this winter.
  • + 1
 should you put screws in every knob or just every other?
  • + 1
 im excited to do this. This is super good and i will definetly do it now
  • + 0
 Great guide! I never ride in snow or ice, (we never get any here), and i found this to be really cool and usefull. Nice one.
  • + 1
 By any chance, did you take any picture inside the tire.. just to see...?
  • + 0
 That'S perfect for me! Thanks.. I guess I have to try.. since mother nature isn't kind enough to make the ice and snow melt....
  • + 0
 EDIT: Here is working link to the picture.
  • + 0
 with smaller screws you reckon this will be effective in really wet conditions?
  • + 0
 No, it doesn't work like that. Screws are very slippery on roots & rocks. I recommend to stick on packed snow and ice with screw tires.
  • + 0
 looks like the metal mulisha

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