AM fork suggestion

xeroth

Greetings,
i need advice for AM fork for my bike :
http://www.haibike.de/produkte_detail_d ... etail.html

I want to put fork with a bit more travel on this model so i need some suggestion.

I plan to put : shorter stem around 50mm,other handlebar with 40mm rise ,and a fork with 140-160mm travel - would that be an overkill for geometry?

Impact RX - Geometry

Frame hight 44 cm 48 cm 52 cm 56 cm
top tube - direct 557 mm 571 mm 580 mm 584 mm
top tube - horizontal 580 mm 595 mm 610 mm 625 mm
Head tube length 135 mm 140 mm 145 mm 150 mm
Head tube angle 69 ° 69 ° 69 ° 69 °
Seat tube angle 72.5 ° 72.5 ° 72.5 ° 72.5 °
Rear end length 430 mm 430 mm 430 mm 430 mm
Wheel base 1089 mm 1104 mm 1119 mm 1135 mm
Wheel size 26 " 26 " 26 " 26

Current front hub : x1900 dt swiss 15mm QR

Thank you,regards!

rockmonkeysc

I wouldn't go to any more than 140mm on that bike, 160 would ruin the handling and possibly over stress the head tube.
It's not an AM bike and never will be one. Something like a Rockshox Revelation dropped to 140mm might work but if you want a harder riding bike it might be time to consider something new.

xeroth

Thanks on the advice,maybe ill try with Fox Vanilla R 140mm
I want to gain a littly bit more stability going downhill while riding aggressively,with current 90mm stem and 1.90 nobby nic tyres i have feeling im going to get throw out of balance

cooldad

Try some wider tyres at lower pressure first. And maybe a slightly shorter stem and correspondingly wider bars.

Cheaper option to start with, and somehow 140mm forks and 1.95 tyres sounds wrong to me.

xeroth

Wider tyres were in plan,short stem around 50mm and bars around 780mm - 40mm rise,i have dabomb bazooka now cutted to 780mm. I will try that ,thank you

supersonic

140mm Pike.

rockmonkeysc

If you're going 140mm the Vanilla R isn't a good choice. It's heavy with no compression damping.
A Revelation will be much better and you will get one used for around the same price.
If you want to ride harder a bolt through axle will help keep the front end under control, I believe you have a QR so it would mean a new front wheel as well.
An angle set would help stability, even with a 140mm fork your head angle is around 68 degrees, if you can get it back to 67 degrees it will be nice and stable and help get the bottom bracket lower which will help in the corners.

BloggingFit

xeroth wrote:

Wider tyres were in plan,short stem around 50mm and bars around 780mm - 40mm rise,i have dabomb bazooka now cutted to 780mm. I will try that ,thank you

Why such a high rise on the bar? Combination of taller fork and those bars will unweight the front end more and reduce your grip through the front wheel under normal riding.

xeroth

I find it cozy on ex Bikes i ridden,thought they were for different type of ridding and use:
Hardtail Rocky mountain flow 2.0 2007 custom with marz am2 160mm ETA and the other one was kona stinky when i rode some Freeride.. Any suggestion for stem size and bars,i prefer bars around 780mm with some rise. On specification theres written "all mounatain geometry" then i thoght i could put atleast 150mm fork

http://postimg.org/image/h4khuxkyl/
http://postimg.org/image/fbt9f9z9j/

Anyway i saw one Hai not 100% if thats same model as mine but i like his setup
http://postimg.org/image/gw2mwi19t/

rockmonkeysc

It might say all mountain geometry but a 69 degree is far from that.
Go too long with the fork and the effects of the raised bottom bracket will show up, mainly poor handling in corners and reduced stability due to the higher centre of gravity.
If you want to ride harder then a low bar is good to give you a better position on the bike, you need your weight low and not too far back. Personally I like no more than 20mm rise and no spacers under the stem.

xeroth

Most likely ill try for now wider tyres,shorter stem and some bars with 20mm rise and leave fork as it is. Truvativ hussefelt would be ok or too heavy?

rockmonkeysc

Good bar. Not the lightest but you really won't notice the extra grammes.

xeroth

Maybe this would be a good choice -
stem : http://www.superstarcomponents.com/en/r ... h-stem.htm or
http://www.superstarcomponents.com/en/p ... d-stem.htm

handlebars: http://www.superstarcomponents.com/en/d ... 80-bar.htm 25mm rise

rockmonkeysc

They are perfectly good stems. Take a look at the Raceface Chester stem.

xeroth

It looks really nice,which stem size and stem rise would you suggest?

rockmonkeysc

There are no rise options for the stem. Length is up to you. It needs to be comfortable for you to ride.

xeroth

Thanks all on advice,cheers

xeroth

Would i gain anything with offset bushings for more agressive geometry? http://www.offsetbushings.com/

rockmonkeysc

Not much and those ones are made of cheese, they lasted four rides in my old Reign X. TF Tuned sell a much better offset bush which lasts a lot longer.
Making too many changes to your bikes geometry will really screw the handling. You really have the wrong frame if you want to make it that aggressive, it's highly unlikely that its strong enough for that sort of riding if it's been designed with XC geometry and short travel suspension.