new bits advice for Trek7300fx (circa 2006)

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Steveo100
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Joined: 13 Jan 2021, 3:01pm

Re: new bits advice for Trek7300fx (circa 2006)

Postby Steveo100 » 14 Jan 2021, 3:50pm

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Last edited by Steveo100 on 15 Jan 2021, 7:16pm, edited 1 time in total.

Steveo100
Posts: 14
Joined: 13 Jan 2021, 3:01pm

Re: new bits advice for Trek7300fx (circa 2006)

Postby Steveo100 » 14 Jan 2021, 3:53pm

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ElCani
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Joined: 5 Mar 2015, 11:24am

Re: new bits advice for Trek7300fx (circa 2006)

Postby ElCani » 14 Jan 2021, 4:01pm

Those chainring teeth do look pretty far gone. If it was me I'd probably just replace like-for-like with another triple chainset, assuming the bottom bracket is ok. Moving to a 1x system would ideally mean using a narrow-wide chainring (to stop the chain falling off over bumps etc) and will generally cost more time and effort to end up with a less-flexible set-up.

peetee
Posts: 2778
Joined: 4 May 2010, 10:20pm
Location: Cornwall

Re: new bits advice for Trek7300fx (circa 2006)

Postby peetee » 14 Jan 2021, 4:07pm

Steveo. If you want to do anything with the information we have provided you need to answer the question both myself and 531colin have asked, namely which cassette cogs do you predominantly use, large or small?
Winter had arrived in the land of Kernow. Along with it came wet roads and cool winds.
“Oh, my wheels and coupling rods!” Peetee exclaimed.

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531colin
Posts: 13325
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Location: North Yorkshire

Re: new bits advice for Trek7300fx (circa 2006)

Postby 531colin » 14 Jan 2021, 4:43pm

Middle and big chainring teeth are worn quite badly, so the chainset will need replacing. (caused by running a badly worn chain!)
So, as Peetee says, the question is, which gears do you use, and which can you do without.
Just as a bit of a guess, you generally seem to use the middle chainring, but also the big one, so 38T, 48T
If you want a single chainring, go somewhere in the middle, say 42T. with a similar cassette as now.
Theres one here for £25 https://spacycles.co.uk/m8b0s109p2188/STRONGLIGHT-ST55-Single-Chainset
Much better quality one for £55 https://spacycles.co.uk/m8b0s109p1699/STRONGLIGHT-Impact-S-chainset-with-double-chain-guard ...not only can you replace the chainring if it wears out, but it has chainguards both sides to keep the chain on.
For either you will almost certainly need a new bottom bracket bearing unit of the correct length.....it might be worth looking at your existing one to make sure you can get it out, ie it isn't rusted in....the tooling won't be too expensive, provided the old and new units use the same tools!

Brucey
Posts: 42208
Joined: 4 Jan 2012, 6:25pm

Re: new bits advice for Trek7300fx (circa 2006)

Postby Brucey » 14 Jan 2021, 4:59pm

FWIW those chainring teeth are a bit knackered.... but is that the best bit or the worst bit? Normally the chainrings are least worn inline with cranks and most worn at about 90 degrees away from this.

In any event the acid test is to see if the worn chainrings make any difference or not when you fit a new chain and cassette. Same as the worn jockey pulleys really; if there is any doubt I'd try them and act accordingly in the event of problems.

FWIW I'd expect the transmission to be a little rough/noisy for a while with those chainrings but it may just settle down after a while. By contrast the cassette is definitely bin-fodder; there is much less leeway with cassette sprockets.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

Steveo100
Posts: 14
Joined: 13 Jan 2021, 3:01pm

Re: new bits advice for Trek7300fx (circa 2006)

Postby Steveo100 » 14 Jan 2021, 6:10pm

peetee wrote:Steveo. If you want to do anything with the information we have provided you need to answer the question both myself and 531colin have asked, namely which cassette cogs do you predominantly use, large or small?


I did mention that I mainly use the middle ring and 4 or 5 of the cogs running up the cassette. It's been a while since riding the bike so didn't take to much notice.

peetee
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Joined: 4 May 2010, 10:20pm
Location: Cornwall

Re: new bits advice for Trek7300fx (circa 2006)

Postby peetee » 14 Jan 2021, 6:17pm

Steveo100 wrote:
peetee wrote:Steveo. If you want to do anything with the information we have provided you need to answer the question both myself and 531colin have asked, namely which cassette cogs do you predominantly use, large or small?


I did mention that I mainly use the middle ring and 4 or 5 of the cogs running up the cassette. It's been a while since riding the bike so didn't take to much notice.


Yes, but all the cogs “run up the cassette”. Do you use the largest or smallest 4 or 5?
Winter had arrived in the land of Kernow. Along with it came wet roads and cool winds.
“Oh, my wheels and coupling rods!” Peetee exclaimed.

Steveo100
Posts: 14
Joined: 13 Jan 2021, 3:01pm

Re: new bits advice for Trek7300fx (circa 2006)

Postby Steveo100 » 14 Jan 2021, 6:31pm

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Last edited by Steveo100 on 15 Jan 2021, 7:15pm, edited 1 time in total.

ElCani
Posts: 340
Joined: 5 Mar 2015, 11:24am

Re: new bits advice for Trek7300fx (circa 2006)

Postby ElCani » 14 Jan 2021, 6:51pm

My girlfriend had a 2007 (I think) Trek 7.3 FX and assuming the rest of the bike is basically sound (and you've already said you like it) I can't see how you're going to end up with something better for £300-500. I'd fix and keep, better for the environment and you end up with something you know works for you!

Jamesh
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Joined: 2 Jan 2017, 5:56pm

Re: new bits advice for Trek7300fx (circa 2006)

Postby Jamesh » 14 Jan 2021, 8:54pm

A chainset, cassette and chain can be had for £50 and it's an easy fix.

If you have a bike library near you they will do the work for very little money.

Cheers James

Ps at least donate it to a bike library for renovation for someone to enjoy.

Steveo100
Posts: 14
Joined: 13 Jan 2021, 3:01pm

Re: new bits advice for Trek7300fx (circa 2006)

Postby Steveo100 » 14 Jan 2021, 10:32pm

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Last edited by Steveo100 on 15 Jan 2021, 7:18pm, edited 2 times in total.

Steveo100
Posts: 14
Joined: 13 Jan 2021, 3:01pm

Re: new bits advice for Trek7300fx (circa 2006)

Postby Steveo100 » 14 Jan 2021, 10:39pm

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Last edited by Steveo100 on 15 Jan 2021, 7:18pm, edited 2 times in total.

Steveo100
Posts: 14
Joined: 13 Jan 2021, 3:01pm

Re: new bits advice for Trek7300fx (circa 2006)

Postby Steveo100 » 14 Jan 2021, 10:41pm

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Last edited by Steveo100 on 15 Jan 2021, 7:13pm, edited 1 time in total.