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PostPosted: Mon Mar 12, 2018 9:22 am 
Retro Guru
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Joined: Tue Jun 25, 2013 10:47 am
Posts: 1145
I always try to find good used chainrings, they are considerably cheaper.
If new, Specialities TA always did nice ones.

Your rear cassette looks quite worn, too. I'd use a Sram PG730 or a used XT


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PostPosted: Mon Mar 12, 2018 9:47 am 
King of the Skip Monkeys
King of the Skip Monkeys

Joined: Wed Nov 07, 2007 4:34 pm
Posts: 29393
granny ring is knackered, front brake cable is too short, tyres are fooped.

New cassette, chainring and chain at least, all new cables and some decent new tyres should see you right.

'granny' ring

https://www.ebay.co.uk/itm/Shimano-SG-J ... Sw9OFZFgNB

Cables by Jagwire

https://www.ebay.co.uk/itm/Jagwire-Comp ... oy6ZayPVXA

7spd cassette

https://www.ebay.co.uk/itm/Sram-Cassett ... Swy6hanEVg

Reasonable quality chain

https://www.ebay.co.uk/itm/KMC-Z8S-8-Sp ... YRhLgL_V1Q


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PostPosted: Mon Mar 12, 2018 10:19 am 
Retro Guru
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Joined: Sun Mar 04, 2012 9:33 pm
Posts: 367
Location: The Kingdom of Wessex
Or if you decide to throw in the towel and "upgrade" I will do you a px on this:

I am 6-1 and this fits me bob-on

Got it from Recycles last year to leave at the train station - but ended up with a Brompton.

They fitted a new rear wheel/cassette/chain/Rear Caliper/ grip shift

I have done about 50 miles on it - mechanically it wants for nothing!

Image
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PostPosted: Mon Mar 12, 2018 2:16 pm 
Dirt Disciple

Joined: Sat Mar 10, 2018 7:58 pm
Posts: 10
Location: Wiltshire, UK
Thanks legrandefromage, that's perfect and helps massively - especially for someone with limited knowledge like myself!

Appreciate the offer fotorat1, but I think I'm going to take on the mini project and get the bike up and running!!


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 Post subject: Re:
PostPosted: Wed Mar 14, 2018 4:11 pm 
Dirt Disciple

Joined: Sat Mar 10, 2018 7:58 pm
Posts: 10
Location: Wiltshire, UK
Chaps, another question...

I want to get a new middle ring. So I think I require a 94 BCD 5 bolt, something like the below;

http://www.chainreactioncycles.com/mobi ... prod142123

Question is this acceptable and will it be compatible with current crankset and new chain?

Or... Can I buy a set of 3 rings, would that be simpler?


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 Post subject: Re:
PostPosted: Wed Mar 14, 2018 4:21 pm 
Dirt Disciple

Joined: Wed Mar 14, 2018 3:56 pm
Posts: 20
Hello Lewis, there's absolutely nothing wrong with that Marin, in fact it's a lovely bike. It's well-made and will probably still be going strong when all those modern carbon bikes are just a pile of splinters! The worn chain rings are not an issue, you can remove them with an Allen Key and fit replacements. All you really need to ensure is that the Bolt Centre Diameter and number of teeth (if you want to keep the gearing ratio the same) on the new chain ring(s) matches the old one. Oh and the front brake cable housing is not really too short, the noodle will swivel and it's only going to get longer when the from suspension is under load anyway, so don't worry about it. I do agree that the tyres are probably shot though. Don't know long you have before your challenge, but everything that's "wrong" with your bike is an easy(ish) fix.....provided those forks are not seized and you go about it the right way. Get yourself a GOOD square taper crank extractor/remover tool and a few other "specialist" tools, you'll find you'll need 'em. Spend a few evenings in the company of "RJ The Bike Guy" on You Tube and get spannering! You've got a nice machine there, don't waste money on a new bike! :)


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 Post subject: Re:
PostPosted: Sun Apr 01, 2018 3:40 pm 
Dirt Disciple

Joined: Sat Mar 10, 2018 7:58 pm
Posts: 10
Location: Wiltshire, UK
Experts out there, I need some assistance. As it's stopped raining and it's bank holiday I thought I'd strip and clean the bike so hopefully I could learn a bit more about it. I've successfully replaced the BB - go me!

Now my other plan was to replace the chainrings as they're knackered, however I didn't realise the middle ring was holding the granny on - its a STX FC-MC34. So basically there's no way for me to secure the granny ring, well without sourcing a Pace RC-21 adapter.

Has anyone got any bright ideas on how to solve this situation? Could I run it as a double, but then would I need new shifters and front derailleur? I don't know what to do as I'm new to all this, please help!

Cheers,
Lewis


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PostPosted: Sun Apr 01, 2018 5:33 pm 
Old School Grand Master

Joined: Tue Jul 05, 2011 8:42 pm
Posts: 3922
Have a look here, might help

viewtopic.php?f=1&t=51037


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 Post subject: Re:
PostPosted: Sun Apr 01, 2018 10:13 pm 
Dirt Disciple

Joined: Sat Mar 10, 2018 7:58 pm
Posts: 10
Location: Wiltshire, UK
Reading that seems like I'm screwed. But I've just purchased some Shimano Deore LX FC-M563 crank arms as I think they've got the correct BCD. Fingers crossed this works or everything will be back on eBay and I'll be looking for a new crankset!


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