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PostPosted: Wed Jul 10, 2013 7:29 pm 
retrobike rider
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Joined: Wed Mar 03, 2010 11:59 am
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Location: Near Southampton
Hi

Thinking of possibly delving into the world of a 29er and need some overall education! Have a bunch of probably dumb questions so bear with me...

- I assume a 29er frame needs a 29er fork not a standard one? (and obviously 29" wheels!)
- Would other components be transferrable from a 26" bike? Drive train, disc brakes stems etc?
- Would a 10 speed frame have the same width between the dropouts as a 9 speed?
- Does a 29er even out the bumps more than a 26"?
- Is it worth going full suss or would a hardtail give enough comfort?


So given that if you had around £500-£600ish for either a full suss frame, or hardtail, forks and wheels what would you get...not after new so second hand fine! Or should I go for a full bike and upgrade? Over all I would like it to be as light as possible but always been fearful of carbon as I weigh over 16 stone!

I've heard good things about Genesis bikes but what would you do??

All comments/opinions gratefully received!

Doug


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PostPosted: Wed Jul 10, 2013 7:56 pm 
Retro Guru

Joined: Mon Feb 01, 2010 8:57 pm
Posts: 774
wookiee wrote:

- I assume a 29er frame needs a 29er fork not a standard one? (and obviously 29" wheels!)
- Would other components be transferrable from a 26" bike? Drive train, disc brakes stems etc?
- Would a 10 speed frame have the same width between the dropouts as a 9 speed?
- Does a 29er even out the bumps more than a 26"?
- Is it worth going full suss or would a hardtail give enough comfort?



If fitting a suspension fork, typically 490mm for 29er but I'm running a 440mm rigid fork on my Ritchey P29 as I like a low front end and nice, sharp handling.

Yes, regular 26" MTB parts will fit, but obviously need to check things like seatpost size, front mech fitting like you would with swapping parts to any frame.

Most MTB frames are 135mm OLN but there are some 142mm rear-end frames about so worth checking.

I certainly feel my Ritchey is smooth over the rough stuff - once up to speed, rolling resistance is noticeably better with tubeless tyres vs 26er with tubes. I'm running 2.4" X-Kings tubeless on P35 rims - they fly!

Full-sus? Depends on the terrain you're riding and your favoured style of riding - I'm happy fully rigid


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PostPosted: Wed Jul 10, 2013 8:21 pm 
retrobike rider
retrobike rider
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Posts: 4437
Location: Near Southampton
monty dog wrote:
wookiee wrote:

- I assume a 29er frame needs a 29er fork not a standard one? (and obviously 29" wheels!)
- Would other components be transferrable from a 26" bike? Drive train, disc brakes stems etc?
- Would a 10 speed frame have the same width between the dropouts as a 9 speed?
- Does a 29er even out the bumps more than a 26"?
- Is it worth going full suss or would a hardtail give enough comfort?



If fitting a suspension fork, typically 490mm for 29er but I'm running a 440mm rigid fork on my Ritchey P29 as I like a low front end and nice, sharp handling.

Yes, regular 26" MTB parts will fit, but obviously need to check things like seatpost size, front mech fitting like you would with swapping parts to any frame.

Most MTB frames are 135mm OLN but there are some 142mm rear-end frames about so worth checking.

I certainly feel my Ritchey is smooth over the rough stuff - once up to speed, rolling resistance is noticeably better with tubeless tyres vs 26er with tubes. I'm running 2.4" X-Kings tubeless on P35 rims - they fly!

Full-sus? Depends on the terrain you're riding and your favoured style of riding - I'm happy fully rigid


Thanks for that...I have fully rigid retro bikes and have been riding an 08 Marin full suss but seems a bit tank like, still trying out a 97 marin full suss, but have never ridden a hardtail much...so thats why I was thinking maybe a 29er hardtail may suit me more and weigh less etc. I ride local woodland trails mainly no big rocks, more roots, tree stumps and fallen trees....oh and always (we are in the uk) gloopy mud!

Are tubeless tyres heavier than the tube and tyre equivilent?


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PostPosted: Wed Jul 10, 2013 9:54 pm 
Retro Guru

Joined: Sat Aug 15, 2009 12:41 pm
Posts: 784
Location: Chiltern Hills
I know nothing about 29ers but am lead to believe this might be a good starting point

http://www.chainreactioncycles.com/Mode ... elID=95383


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PostPosted: Wed Jul 10, 2013 10:48 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4422
Location: Herts UK
Isnt there a odiscussuon here about the merits if a 29er

Yes it is easier to roll but larger wheels mean slower to steer.... and to counter that they have wider bars

They are heavier than eqivalent 26er


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PostPosted: Wed Jul 10, 2013 11:07 pm 
retrobike rider
retrobike rider
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Joined: Wed Mar 03, 2010 11:59 am
Posts: 4437
Location: Near Southampton
02gf74 wrote:
Isnt there a odiscussuon here about the merits if a 29er

Yes it is easier to roll but larger wheels mean slower to steer.... and to counter that they have wider bars

They are heavier than eqivalent 26er


hmmm how much heavier?


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PostPosted: Wed Jul 10, 2013 11:46 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4422
Location: Herts UK
how long is a piece of string? would depend on model, parts fitted and type: rigid, hardtail or fs.

i'll take a guess at a lightweight carbon fibre hardtail.
- frame, longer seat and chain stays, longer down tube usually curved to clear forks crown, shorter headtube = 100g
- forks, longer sliders but shorter steerer = 100 g
- wheels, larger diameter rims, longer spokes = 100 g
- larger diameter tyres, rim tape and inner tube and more air = 150 g

so my guesstimate is about 450 g or 1 lb

a like for like comparison: http://mbaction.com/Main/News/26er-Vers ... -4713.aspx

weight differnce is more since they are Al frames and lower spec. components than my "idealised" lightwieght CF hhardtailabove.


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PostPosted: Thu Jul 11, 2013 6:17 am 
Retro Guru
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Joined: Sun Mar 14, 2010 2:33 am
Posts: 2917
Location: daaan saaaf
29ers look funny. :P

Especially in smaller frame sizes.


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PostPosted: Thu Jul 11, 2013 8:17 am 
Retro Guru
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Joined: Thu May 03, 2012 7:13 pm
Posts: 2574
Location: The Cock Inn, Tillett, Herts
I wouldnt touch a £600 29er. You need to be around the grand mark on frame, forks and wheels to get a stiff frame and non flexy wheels. A cheap 29er is dire, but a decent one can be fun, in the dry at least.


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PostPosted: Thu Jul 11, 2013 10:43 pm 
BoTM Winner / retrobike rider
BoTM Winner / retrobike rider
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Joined: Mon Jun 30, 2008 8:24 pm
Posts: 5667
Location: Dorset
My first big-wheeler arrived today...

Image

Hoping to get out and give it a good thrashing tomorrow afternoon :D


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