Rigid Fork for a Trek 4100

[cyclecycle]

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]

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]

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]

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]

Hi,

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



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]

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,