THE WHEEL BASE THREAD

Message Bookmarked
Bookmark Removed

I PERSONALLY ENJOY A SHORTER WHEEL BASE, ESP ON MY MOUNTAIN BIKE...MAKES FOR TIGHTER TURNS.

IS THERE ANY PRACTICAL WAY TO SHORTEN A WHEEL BASE ON A BIKE....ON A FIXED GEAR, U CLD SHORTEN THE CHAIN....BUT IM THINKING OF MY FULL SUSPENSION MTB.

MAYBE CHANGING THE TRAVEL ON THE REAR SHOCK? OR SOMETHING???

ANY IDEAS....?

ddb, Wednesday, 14 November 2007 20:47 (seventeen years ago)

Dunno what forks you've got, but all I could think of is that you could try and find something with a minimal amount of offset between the steerer tube and the stanchions. Not sure really how much variation there is in this between suspension forks though (possibly none?).

NickB, Wednesday, 14 November 2007 23:46 (seventeen years ago)

would toe overlap be a major issue for MTB?

Steve Shasta, Thursday, 15 November 2007 01:32 (seventeen years ago)

ddb post a pic of yr frame

gbx, Thursday, 15 November 2007 01:58 (seventeen years ago)

http://www.konaworld.com/Prod/000000317/2K6_COILER_650.jpg

ddb, Thursday, 15 November 2007 03:03 (seventeen years ago)

MY SINGLE SPEED MTB, TURNS ON A DIME!! THIS THING IS LIKE DRIVING A TANK.

ddb, Thursday, 15 November 2007 03:05 (seventeen years ago)

NO TOE OVERLAP ON THIS BITCH!!!

ddb, Thursday, 15 November 2007 03:06 (seventeen years ago)

SRSLY, I REGRET GETTING THE BIGGER SIZE. THE DUDE AT THE SHOP WAS ALL "BIGGER BRO".......AND I WAS LIKE "YEAH BUT........OK"

ddb, Thursday, 15 November 2007 03:08 (seventeen years ago)

Dropping the travel on the fork would definitely quicken up the steering, but it might defeat the point of a bike like that.

NickB, Thursday, 15 November 2007 13:59 (seventeen years ago)

doesn't look like much can be done in the rear, so yeah: if you shortened the travel you'd end up with a shorter wheel base and a steeper headtube angle, both of which would make the turning quicker

gbx, Thursday, 15 November 2007 14:15 (seventeen years ago)

YEAH, I ALREADY RETUNED THE FORK, ADJUSTED THE TRAVEL AND DAMPING I THINK IM JUST GONNA CUT THE FRAME IN HALF, LOSS AN INCH AND WELD IT BACK.

ddb, Thursday, 15 November 2007 16:39 (seventeen years ago)

yeah ok!

cutty, Thursday, 15 November 2007 16:43 (seventeen years ago)

Turning your forks round back-to-front would work too, but your bike probably wouldn't.

NickB, Thursday, 15 November 2007 16:55 (seventeen years ago)

Actually you could just reverse the crown, then put the legs back on the right way.

NickB, Thursday, 15 November 2007 16:57 (seventeen years ago)

"right way"

NickB, Thursday, 15 November 2007 16:58 (seventeen years ago)

Backwards fork = more trail = more stable, right? Which, actually, is not what you want.

ledge, Thursday, 15 November 2007 17:00 (seventeen years ago)

Also, backwards fork = disc mount on the front = braking force goes up, not down, so no fear of wheel popping out of dropouts!

I may be oversimplifying somewhere.

ledge, Thursday, 15 November 2007 17:02 (seventeen years ago)

^^^ not true? i mean, on any of my bikes (road/track) reversing the fork would make for negative trail/rake, making it super-turny to the point of instability.

(xp)

gbx, Thursday, 15 November 2007 17:04 (seventeen years ago)

Also, backwards fork = disc mount on the front = braking force goes up, not down, so no fear of wheel popping out of dropouts!

Yes, there is that - you'd have to travel everywhere backwards for your brake to work.

NickB, Thursday, 15 November 2007 17:05 (seventeen years ago)

Sorry, I misread wot you rote.

NickB, Thursday, 15 November 2007 17:07 (seventeen years ago)

I think I put my mind in backwards.

NickB, Thursday, 15 November 2007 17:08 (seventeen years ago)

Well looking at the pic above: the fork is placed in front of the steerer tube, and the axle is in front of the fork legs, both of which mean the wheel is placed further forward, reducing the trail... right? So flipping it round should mean the wheel is further back and the trail is larger.

xposts

ledge, Thursday, 15 November 2007 17:08 (seventeen years ago)

My flatmate got a replacement bike after hers was nicked, and the forks were put on backwards. I don't think she'd have noticed. If she rode it, ever.

ledge, Thursday, 15 November 2007 17:09 (seventeen years ago)

What is "the trail"?

NickB, Thursday, 15 November 2007 17:10 (seventeen years ago)

Distance between where the front wheel touches the ground, and... er... where the steerer tube would touch the ground if you continued it downwards at the same angle. Should be in front of the front wheel contact point. Longer trail = more stability. Shorter trail = more manoeveueurability.

ledge, Thursday, 15 November 2007 17:17 (seventeen years ago)

Because the steering axis contact point is in front of the wheel contact point (positive trail), it means if you lean the bike in one direction, the wheel turns in that direction - so the bike keeps itself upright, steering under itself as it tilts. Negative trail would mean it would turn in the opposite direction to the lean, making it v difficult to ride.

http://upload.wikimedia.org/wikipedia/en/thumb/c/c7/TrailDIAG2.jpg/400px-TrailDIAG2.jpg

ledge, Thursday, 15 November 2007 17:21 (seventeen years ago)

NICE, THIS IS WHAT IM TALKING ABT!!

NICK B GETS A BANANA, REVERSING THE CROWN...AND SWITCHING THE FORKS MIGHT WORK!!!!!

JUST WONDERING IF THE CROWN WOULD HIT THE DOWN TUBE.

HIGH - 5 DUDES!

ddb, Thursday, 15 November 2007 17:43 (seventeen years ago)

HMM, BUT WOULD THAT FCK UP THE -/+ AIR....HMMMMMMMMMMM

ddb, Thursday, 15 November 2007 17:44 (seventeen years ago)

NO, IT SHDNT. I THINK.

IT TOOK SO MUCH TO GET THOSE FORKS TO ACTUALLY "WORK"....THEY ARE PRETTY SHIT. IF I HAD $700 LYING AROND I'D REPLACE THEM

ddb, Thursday, 15 November 2007 17:50 (seventeen years ago)

http://www.beranger.org/miscd/brother_pt80_labelmaker.png

gbx, Thursday, 15 November 2007 17:50 (seventeen years ago)

GBX ARE U POSTING FROM YR BIKE? OR DID U HIGHJACK A MACHINE DURING A PICK-UP?

WHY A LABEL MAKER?

ddb, Thursday, 15 November 2007 17:54 (seventeen years ago)

i have a doctor's appt today, and am at home drinking tea.

i suggested a label maker for the +/- on yr fork, but oh well nevermind

gbx, Thursday, 15 November 2007 17:57 (seventeen years ago)

AHHHHHHHHHHH.

WELL PLAYED!

ddb, Thursday, 15 November 2007 17:59 (seventeen years ago)

After reading Ledge's pitch and then reading some other stuff, I dunno if reversing the crown would work or not. The more you learn, the more confusing it all gets. You'd increase the trail, shorten the wheelbase, raise the front end and also slacken the headtube angle. God knows what the net effect would be.

Maybe riding into a tree repeatedly might do the job just as well? Other than that, is there any way of running the forks a bit slacker without bolloxing up the feel too much?

NickB, Thursday, 15 November 2007 20:22 (seventeen years ago)

I RUN THE FORKS PRETTY STIFF, THE BIKE WEIGHS A TON...SO IF THE FORK WERE ANY SOFTER, CLIMBS WOULD ALWAYS END IN VOMITING.

ITS A DOWNHILL BIKE...I JUST HAVE TO ACCEPT IT FOR ALL IT'S LIMITATIONS

ID SELL IT, BUT I'D TAKE SUCH A LOSS. I GUESS YOU LEARN WHAT U LIKE/NEED WITH EACH BIKE.......I NEED ANOTHER MTB. XC.

ddb, Thursday, 15 November 2007 21:06 (seventeen years ago)

i demo'd rocky mountain's highest-end XC and it was unreal. like changed how i conceive of mountain biking (that is, it is definitely a viable means of transport for very extended journeys in the backcountry).

gbx, Friday, 16 November 2007 00:33 (seventeen years ago)


You must be logged in to post. Please either login here, or if you are not registered, you may register here.