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Gear skipping issues (new to self bike maintenance!)

Old 04-22-21, 05:05 AM
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OliverMTB1999
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Gear skipping issues (new to self bike maintenance!)

Hi,

Iíve recently started getting into mountain biking. Iíve started with a decent budget hardtail but still keep running into issues. Iíve spent a lot on the bike and canít really afford to keep up with the repairs! To save money Iíve decided to learn how to do these repairs myself.

I recently managed to strip all the thread from the crank arm so replaced it for a new shimano crankset. The only issue was the chain ring it is was slightly bigger. Just giving it a quick ride around it seemed alright but after taking it on trails I realised in gear 1 and 2 it catches really bad and now has a tendency for the chain to come off! (Itís an 8 speed box 4 by the way). I canít tell where itís catching because when I get off the bike and pedal it with my hands it doesnít make the noise.

I thought it may be due to the chain being to small for the new chainring as the derailleur was a bit stretched out in those gears. I have since changed over the chain to a slightly longer one but still have the same issue. Can anyone advice what this may be? All the higher gears work great and I have no issues with those! There is a slight bit of movement in the crankset though I think it needs a small spacer but Iím not sure that would be causing it

thanks,
oli

Last edited by OliverMTB1999; 04-22-21 at 05:09 PM.
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Old 04-22-21, 08:12 AM
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"Box 4 gearbox" is not a reference I know of. Is this a brand name or your term?

With incomplete data it's hard for us to diagnose long distance. Since I don't know the gear system I can't even begin to list the usual possibilities. If terms are a challenge I suggest going to the Park Tool co website and looking at their Big Blue Book or the Sheldon Brown site as a start. Andy
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Old 04-22-21, 05:12 PM
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Hi - thanks for the advice, sorry I think I just meant box 4, not box 4 gearbox! Itís an 8 speed and I think the box 4 part I was referring to is the derailleur, not quite there with my bike part names yet😂

Originally Posted by Andrew R Stewart View Post
"Box 4
gearbox" is not a reference I know of. Is this a brand name or your term?

With incomplete data it's hard for us to diagnose long distance. Since I don't know the gear system I can't even begin to list the usual possibilities. If terms are a challenge I suggest going to the Park Tool co website and looking at their Big Blue Book or the Sheldon Brown site as a start. Andy
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Old 04-22-21, 07:10 PM
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Originally Posted by OliverMTB1999 View Post
To save money I’ve decided to learn how to do these repairs myself.
I recently managed to strip all the thread from the crank arm
the chain being to small for the new chainring as the derailleur was a bit stretched out
There is a slight bit of movement in the crankset though I think it needs a small spacer
not quite there with my bike part names yet
No offense, but I don't think you're going to save any money by attempting trial-and-error repairs on parts that you can't even identify. If I understand it correctly, you're having a problem with the derailleur dropping the chain -- which might be solved by adjusting the limit screws -- but if there's movement in the crankarms, you need to address that first. But I'm not at all convinced your chain is the right length or that your new crankset is even compatible. Instead of adding a random spacer (?), cut your losses now and take it to a shop.

Last edited by Rolla; 04-22-21 at 07:21 PM.
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Old 04-22-21, 07:36 PM
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It's pretty common to spend more then a shop will charge for the first few repairs you do yourself if you're just beginning. The tools and the mistakes collectively add up quickly. It's when you do stuff a couple+ times that the costs start to even out and after a few more you are cost wise ahead. And you also begin to learn how to avoid some problems before they happen. Of course the more mechanical savvy the beginner the shorter the learning curve is and I tend to agree with Rolla that the OP hasn't expressed much skills in this area, problem solving and self learning. Sorry to say that out loud. Andy
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Old 04-22-21, 08:16 PM
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Originally Posted by Andrew R Stewart View Post
"Box 4 gearbox" is not a reference I know of. Is this a brand name or your term?
​​​​​​https://boxcomponents.com/products/b...lleurs-8-speed
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Old 04-22-21, 11:13 PM
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Originally Posted by dedhed View Post
Thanks, I had searched with "box 4 gear box" and nothing bike related came up. Andy
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