elokahn
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Post by elokahn on Feb 8, 2006 19:55:20 GMT 8
do you think 13" is high enough for DH? i know it's mostly 15"s but hirap kasi tumukod. share us your thoughts... thanks!
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Lance_R_evo
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Post by Lance_R_evo on Feb 8, 2006 21:56:08 GMT 8
many DH built bikes I see in mags always have 13" bb height, while freeride bikes commonly have slightly higher....or higher if you drop big.
having a high bb height than 13" on a racing DH bike would make the bike harder to pedal, I think.
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elokahn
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Post by elokahn on Feb 9, 2006 11:25:01 GMT 8
13" lower or higher? my main prob lang naman is i cannot make tukod because the bb is too high and i cannot pedal good because dko na pwede itaas yung saddle because it's too high already. good thing my frame is adjustable so i can nake the bb height from 12" to 15".
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Post by PT on Feb 10, 2006 13:31:55 GMT 8
what size is your frame?? maybe its big for you ..
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Lance_R_evo
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Post by Lance_R_evo on Feb 10, 2006 13:54:45 GMT 8
wait, seems to be a different problem...
is the problem where you can't pedal properly from the saddle because the sadle is too low? like XC bikes? so you can pedal efficiently from the saddle, am I right?
if this is your problem, the only solution is to live with it. ;D DH bikes aren't supposed to have very high saddles, since most of your pedaling is done when standing.
for freeriding, or normal trail usage, a relatively high saddle for this type should only go as far as your handlebars, anymore higher and you sacrifice your balls....in relative terms....
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Lance_R_evo
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Post by Lance_R_evo on Feb 10, 2006 13:57:49 GMT 8
also... BB height isn't relative to the frame, much to my knowledge, BB height commonly rises when mated with longer travel forks.
Try a fork with lower Crown to tire height, most forks have at most 2" excess tubing that isn't used by the suspension. or try lowering your stanchios at the crowns, see how it feels, this will mostly lower your BB height...also dial in your suspension at the rear shock....
hope this helps.
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Post by >rocketman> on Feb 10, 2006 18:30:00 GMT 8
bb height is rider preference. therefore not a "standard"
14 inch is my setting, on my dh race biike (crank bolt center to flooring) pag inupuan lower pa, my frame is adjustable, also 180 mm of exposed stanchion on my 7 inch boxxer, to get this height.
This is a fact, a bike with low bb ht setting, close to the ground, rails the berms faster. same sa 4x bikes.
disadvantage is obstacles rock or roots can be hit while pedalling, So with my 170 mm crank i try to keep it level (horizontal)l, pag na sa techy section na.
its ok to dab your feet, for start,
but try to learn not to dab in the techy stuff it slows you down and worse case you may get injured kapag nag dab ka hi speed
were riding mtbikes, let your fork and shocks do the work.
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elokahn
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Post by elokahn on Feb 10, 2006 18:53:23 GMT 8
@ endoboy, frame size fits right for me. small. @ lance, something like that... kasi i can't lift my saddle a little higher bacause i can't make tukod. its only my problem on urban and climbing. but for DH it's alright for me. i just want to make my bb height an all around. can't have a lower than 6" fork, d bagay sa frame. ;D @ rocketman, i got a drop-off triple for a fork with 6.5" travel, adjustable din frame ko so i try every possible adjustments that would suit me. maybe i'll stick with 14". i'm comfy with it for now eh. ;D ;D
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Post by eiwol on Feb 10, 2006 21:55:59 GMT 8
BB Height is also affected by the tires you use and the diameter of your wheels. correct me if i'm wrong, i think you can lower the BB height by using 24"wheels.
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Post by Poseur on Feb 11, 2006 0:55:31 GMT 8
messing w/ your wheels to lower your BB height.... that's desperation. you're messing w/ your bike's geos and handling big time.
I had tires up there earlier... typo, i meant wheels.
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Post by eiwol on Feb 11, 2006 1:30:20 GMT 8
not just tires but also the wheels...
yup! it will be a desperation move to lower the bottom bracket
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Post by vertigo on Feb 11, 2006 4:47:20 GMT 8
not unless you're using the bighits or any frame with a default 24' rear wheel setup, tinkering the BB height with tyre compensation is like not going the right direction.
i read somewhere that DH race bikes are usually higher in BB heights that that of dedicated FR bikes, i don't know...i think it's still rider preference ;D
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Post by Poseur on Feb 11, 2006 6:15:22 GMT 8
Vertigo,
That's the other way around; DH is lower and FR is higher. Lower for high speed stability in straights and turns. ie. Turner DHR, Balfa BB7. FR: High for clearance on rocks and drops.
Think about it.
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elokahn
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Post by elokahn on Feb 12, 2006 20:04:03 GMT 8
it's usually 14" right? tried that height at the race course for the upcoming race in maarat, does well...
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Post by puregutz on Feb 18, 2006 22:39:15 GMT 8
I think 13" BB height is too low considering that DH bike would still sag 1-3 inches. Mine has 4" of sag... 14" to 14.5" would be an ideal height.
Although rocketman is right. The lower the BB height, the lower the center of gravity... more stable in cornering... But ofcourse you also have to consider big obstacles in the trail... Like that big nasty root in the middle section of the laoag dh course. (andun pa rin ba yun last race? sayang i missed it!). Coming from a short uphil climb it always hits my chainguide.....
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Post by >rocketman> on Mar 5, 2006 18:36:57 GMT 8
last race, Jay, the root is still there,
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elokahn
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Post by elokahn on Mar 5, 2006 23:25:23 GMT 8
can't it be hopped?
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Post by PT on Mar 6, 2006 10:02:42 GMT 8
from an uphill climb,left turn,after 5 feet that root is lying there! when you pass it, its a techy right turn with a few baby heads which leads to a tight righ turn .. hmmm .. in short .. you can hop it but it will ruin your momentum (if you have any) from the uphill climb .. and thats just 1/5 of the track .. cmon guys .. thats what bashguards are for ...
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Post by puregutz on Mar 6, 2006 13:40:53 GMT 8
I tried and was able to get over it during practice. But I couldnt seem to time it perfectly during the race. Its hard coming from an uphill.
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Post by PT on Mar 6, 2006 14:28:44 GMT 8
yep .. the short uphill climb could really ruin one's run ..
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Post by >rocketman> on Mar 6, 2006 17:48:19 GMT 8
should be chopped hehehe
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elokahn
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Post by elokahn on Mar 6, 2006 19:57:26 GMT 8
it's always a different feeling during practice and the race proper, when you're in practice you are a perfectionist but when it's race day its "bahala na". how do you guys get over it?
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MASTERneilsvhongqui
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the funny thing is that my bike actually looks something like this.
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Post by MASTERneilsvhongqui on Mar 6, 2006 21:21:23 GMT 8
wait, your problem is you standover height. to see if the frame is right for you, you should still be able to stand up on the ground over your bike with your crotch barely hitting or not hitting your saddle at all.
anyway, yeah, that root in laoag really got to all the riders. you could really see fresh chain ring and chainguide marks carved into it. impossible to hop too cuz there's this big rock in front of it.
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Post by PT on Mar 6, 2006 22:06:22 GMT 8
it's always a different feeling during practice and the race proper, when you're in practice you are a perfectionist but when it's race day its "bahala na". how do you guys get over it? try to do full runs whenever you practice .. do it like a race run .. in a race run you dont stop and go back whenever you mess up .. you just keep on riding down .. full runs will really help you dial in the race track .. just remember to pick your own line and stick to it.that way you are assured that you can go down the track clean as practiced. steve peat said "go choose your own line,dont be a sheep" because another rider's line may not be the best for you.. i also do full runs coz i hate stopping in the middle of the track then push my bike after ..! heheh .. peace! dude,join the ride this saturday .. maarat race track ..
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Post by vertigo on Mar 7, 2006 1:59:00 GMT 8
Vertigo, That's the other way around; DH is lower and FR is higher. Lower for high speed stability in straights and turns. ie. Turner DHR, Balfa BB7. FR: High for clearance on rocks and drops. Think about it. yeah i got it all the other way around, what i meant actually is DH bikes is lower and FR is slightly higher, stand corrected hehehe i just measured my Mongoose FS and is measured 14 1/2 inches, perfect for both disciplines ;D but still it boils down to rider preference though
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elokahn
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Post by elokahn on Mar 7, 2006 14:14:57 GMT 8
@ endoboy, that was my problem last race, didn't have the chance to heat up because they immediately started the DH race right after the XC, they shouldn't have conducted both races at the same day. hmmm.... might come this saturday but unsure, what's the event? oh the tutorials?
@masterneiletc. hehe, natumbok mo! standover height it is! you saw my bike na right? that was in 14" and my toes are the only support i have when standing upright, and the saddle just have enough height for me to pedal properly while seated. then, i am planning to use cleats and i don't know if that would be proper. waaaah!! dami problema ah!!
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Post by PT on Mar 7, 2006 22:31:52 GMT 8
dude it might be this saturday or sunday .. i'll let you know as soon as i know ..ü
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Post by nightcrawler on Mar 10, 2006 18:16:49 GMT 8
The IH Sunday is the frame with the lowest bb height 13.9" for close course DH racing. Some reviews warrants the user to use strong cranks. However other really can go along at this low bb. Its a big plus because it has a lower of center of gravity.
Intense M3 has 14.15. It is about the standard of downhill racing. So if your bb height is between 14 - 14.5 thats very good for racing. Its stable.
Beyond these (14.5 to 15) its for freeride/extreme freeride because its good for getting over big rock, roots and steep terrain like the Northshore. It is this place where the geometry of freeriding was born.
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Post by >rocketman> on Mar 13, 2006 21:20:47 GMT 8
sir chonny chan, night crawler will hans gee import this iron horse sunday?
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Post by nightcrawler on Mar 14, 2006 15:11:14 GMT 8
Sorry we tried. It was offered to us before it went out to the market. We place an order. However they kept moving the delivery dates.... month after month (hagang tumagal at na wala na). Some country's have the same problem, but they were still able to get it even if it was long overdue, some cancelled their orders.
Last year we tried to get a sunday frame for me (para masubukan). We got no reply...
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