Rigid Fork for a Trek 4100

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cyclecycle
Posts: 12
Joined: 1 Jun 2014, 8:43pm

Rigid Fork for a Trek 4100

Postby cyclecycle » 1 Jun 2014, 8:47pm

Hello,

I have an old Trek 4100 hard tail mountain bike that I use for a commuter.

http://www.bikepedia.com/quickbike/Bike ... model=4100

I'd like to replace the front fork with a rigid one. I'd like to keep the same geometry when I do this.

Is somebody able to kindly provide a link to a fork that would allow this? I can fit the fork myself, just not sure exactly what I need to keep the same geometry.

Many thanks in advance,

mrjemm
Posts: 2933
Joined: 20 Nov 2011, 4:33pm

Re: Rigid Fork for a Trek 4100

Postby mrjemm » 2 Jun 2014, 12:58am

Hi CC. I couldn't swear on the geometry, but a fork worth looking at may be the Surly 1x1-

http://surlybikes.com/parts/forks/1x1_fork

Available quite cheaply at- http://www.bike24.com/p28425.html

To keep the same geo, I guess you need someone (who knows more than I, i.e. most folk) with a clue to the original geo.

Good luck.

keithb
Posts: 48
Joined: 23 Jan 2014, 10:33am

Re: Rigid Fork for a Trek 4100

Postby keithb » 2 Jun 2014, 4:39am

Do you know what the travel is on the original forks?

The main thing to look out for is the length of the rigid fork, measured axle to crown (a-c).

440-445mm for 100mm travel forks.
420-425mm for 80mm travel forks.
410ish mm for 50-60mm travel forks.
390mm for non suspension corrected forks.

Fork rake info is harder te come by but I don't think that varies too much on mtb forks.

These numbers are based on 26" wheels by the way, 29er's have fork lengths more like 450mm+ I believe.

cyclecycle
Posts: 12
Joined: 1 Jun 2014, 8:43pm

Re: Rigid Fork for a Trek 4100

Postby cyclecycle » 2 Jun 2014, 7:39pm

Hello,

It's an Insync Grind 320 fork which I think is 70mm travel.

Many thanks for the good info and the links; much appreciated.

sreten
Posts: 347
Joined: 29 Sep 2013, 10:59pm

Re: Rigid Fork for a Trek 4100

Postby sreten » 2 Jun 2014, 10:31pm

Hi,

TBH I wouldn't worry about the geometry too much,

Image

Dropping the front is not a bad idea for a commuter, rotating your body
position a little clockwise and effectively down a little. Its probably just
not worth being concerned about overall, the fork offset mattering more.

Nice tyres for commuting, I like Schwalbe City Jet's, or Michelin City's.
Fit the fattest IMO, the City's have a nice reflective stipe option.

rgds, sreten.

cyclecycle
Posts: 12
Joined: 1 Jun 2014, 8:43pm

Re: Rigid Fork for a Trek 4100

Postby cyclecycle » 3 Jun 2014, 12:45pm

Hello,

Many thanks for this.

I've already put on a set of Schwalbe City Jets and they made a real difference (to the point I'm thinking of keeping the bike and upgrading a bit more rather than get a dedicated commuter).

Just needs a set of mudguards and a rack and should be a keeper:

http://www.wiggle.co.uk/zefal-paragon-mudguards/

www.amazon.co.uk/Topeak-Super-Tourist-T ... 004BU99I4/

... and a set of peddles perhaps!

Many thanks,