Looking for specialist MTB bike mechanic

[Ruben Hechter]

I have actually experienced a chain slipping off the big chainring at the front on a 3X. Turns out my BB was loose. It was those cheaper extremely heavy threaded BB's. Worth a check on your bike

[dasilvarsa]

Probably Better to Convert to 1X if the BB and RD Are OK.

 

[Sandro]

For those who asked, this is the famous chainring. Looks pretty worn to me but I'm no mechanic?

Its a Scott Spark 960 by the way, 2014/2015 model I suspect. Excuse the dirty bike.

Edited September 4, 2022 by Sandro

[RobertWhitehead]

I will be able to take a look for you if you want. 

[Barry]

1 hour ago, Sandro said:

For those who asked, this is the famous chainring. Looks pretty worn to me but I'm no mechanic?

Its a Scott Spark 960 by the way, 2014/2015 model I suspect. Excuse the dirty bike.

The chainring looks like it has seen better days. Maybe @RobertWhitehead has a chairing you can swap and test. I may be wrong but that derailleur looks very high from the chainring. 

[RobertWhitehead]

6 minutes ago, Barry said:

The chainring looks like it has seen better days. Maybe @RobertWhitehead has a chairing you can swap and test. I may be wrong but that derailleur looks very high from the chainring. 

Yes, I do have lots of spares but I have a question: which bike shops did you use? That FD is so high it could almost be confused for the bottle cage holder . 

[LazyTrailRider]

It would be extremely surprising if that chainring did NOT slip. It’s moertoe!

[DieselnDust]

2 hours ago, Sandro said:

For those who asked, this is the famous chainring. Looks pretty worn to me but I'm no mechanic?

Its a Scott Spark 960 by the way, 2014/2015 model I suspect. Excuse the dirty bike.

Shiver me timbers …….

that doesn’t look like any Mtb chain ring I’ve ever seen. Whatever it is it was worn out pre covid.

as mentioned FD is too high, 

[Sandro]

I think you guys have helped me figure out the problem here, I had a close look at the chainring and FD. Is it possible that the derailleur is not necessarily too high but the chainring is too small? The derailleur SLX FD-M660E is supposed to work off a 44 chainring and the one I have is a 40. That derailleur is also only supposed to be for 9 speed from what I can see and mine is 10?

 

[DieselnDust]

1 minute ago, Sandro said:

I think you guys have helped me figure out the problem here, I had a close look at the chainring and FD. Is it possible that the derailleur is not necessarily too high but the chainring is too small? The derailleur SLX FD-M660E is supposed to work off a 44 chainring and the one I have is a 40. That derailleur is also only supposed to be for 9 speed from what I can see and mine is 10?

 

A Mtb triple chainring FD is essentially the same across 7, 8, 9 and speed systems. The difference between one for 40t and 44t isn’t so significant. What is is the degree of wear on those parts

[stephenplumb]

Remember that the whole drive train is a system. The best thing you can do is replace the chain pretty often, but if you allow the chain to stretch, then it in turn wears out the gears it engages with. If that happens you have no choice but to replace all the gears and chainring. Getting half arsed at this point will just mean that whatever new parts you fit will get quickly wrecked by the old parts you left behind.

Looking at the bike, and considering the lack of spares (at least when I was looking) for older bikes, you may well be better served by doing a 1x conversion to get it up to speed? WE did this on my sons bike, which grossly overcapitalised it, and then soon after he sold it to buy an enduro bike!! 

 

[Sandro]

1 hour ago, DieselnDust said:

A Mtb triple chainring FD is essentially the same across 7, 8, 9 and speed systems. The difference between one for 40t and 44t isn’t so significant. What is is the degree of wear on those parts

So should work with the 10 speed as well? The chain and cassette are new, chainring is toast judging by the comments. Just amazes me that two bike shops couldn't pick this up each after doing a major service 

[Sandro]

37 minutes ago, stephenplumb said:

Remember that the whole drive train is a system. The best thing you can do is replace the chain pretty often, but if you allow the chain to stretch, then it in turn wears out the gears it engages with. If that happens you have no choice but to replace all the gears and chainring. Getting half arsed at this point will just mean that whatever new parts you fit will get quickly wrecked by the old parts you left behind.

Looking at the bike, and considering the lack of spares (at least when I was looking) for older bikes, you may well be better served by doing a 1x conversion to get it up to speed? WE did this on my sons bike, which grossly overcapitalised it, and then soon after he sold it to buy an enduro bike!! 

 

I'm seriously looking at this, does it mean having to change hubs as well? 

[stephenplumb]

I think when we did my sons bike, we did need to replace the back hub as the offsets change for the newer drivecahins.

 

[Barry]

4 minutes ago, Sandro said:

I'm seriously looking at this, does it mean having to change hubs as well? 

All depends on availability of a XD driver for your hub to go 12speed can use a Sunrace cassette on your existing hub .

[droo]

On 9/4/2022 at 8:22 AM, Jewbacca said:

Without seeing, touching and inspecting, I'm Stevie Wonder reading sub titles.

 

This.

Everything else is speculation (aside from the FD being that's almost mounted on the seatpost).