the belt on my focus planet 8 is becoming a bit loose and I thought of tightening it.

The rear wheel setup on the focus is similar to the one in the video from bikefriday below:

What is different is that my bike does not have the adjuster holes to change the tension. There is the big long thread, but at the end there is no hole for an allan key nor is there a hole for a screwdriver to adjust?

Pictures below:

enter image description here enter image description here enter image description here Does anybody know how to deal with this?

Below are the pictures from the side: sideview1 sideview2

I imagined that the process should be: open the 2 bolts from the outside, then tighten the inside "bolt" on the chainstay. however I don't see a way how to perform the last step, as it is not a bolt nor a screw that i have on the inside chainstay.


  • I think a picture will vastly improve the chances of getting a useful answer - please upload one. Jul 31, 2017 at 8:05
  • Did you receive a manual with the bike? That would tell you how to adjust belt tension. Jul 31, 2017 at 13:25
  • Unfortunately no manual with the bike. Also I checked the website of derby cycles, and the manual they have is very generic and doesn't explain :( Jul 31, 2017 at 13:52

1 Answer 1


It's hard to tell from your pictures, one from the side would be nice. I did a search and came up with the following picture.

Focus Planet 8

If this is what your bike looks like, then you need to loosen the two bolts I've labeled on both sides (4 total) and slide the wheel back until the belt is tensioned correctly. Make sure the wheel is straight and even on both sides when tightening everything back up. From looking at your pictures, it also looks like you should tighten the bolt on the inside of the chainstay where you've circled in red to prevent the wheel from slipping.

  • Hi Kibbee,the picture you posted is exactly how it looks on my bike. The loosening the green labeled bolts should be doable. But I don't know how to tighten the bolt on the inside of the chainstay (circled in red). There is no bolt/screw. Just the long thread. I will take a pic from the side and upload. Jul 31, 2017 at 13:23
  • Yeah, I'm not really familiar with this type of setup so maybe somebody else can chime in once we have some better pictures. If there's no head on the front facing side, then there must be a bolt head on the other side, although it's not quite clear how one would access that.
    – Kibbee
    Jul 31, 2017 at 13:28
  • 1
    It looks like you tighten the tension bolt with an allen key. If you look at your (the OP's) photo carefully, you can see it takes a small allen wrench (aka hex key, hex wrench).
    – RoboKaren
    Jul 31, 2017 at 15:02
  • ok cool, let me try with a small allen. Jul 31, 2017 at 15:06
  • Thanks RoboKaren, you were right. I initially thought allen key would not fit. But it turns out that it was just gunked up with mud. After cleaning, allen key fitted. If you post your answer as "answer" instead of comment i will gladly accept it. Jul 31, 2017 at 17:41

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