a friend of mine rides a rigid bike for commuting and he complains of lower back pain while riding. he is using a specialized body geometry saddle on his 17" marin palisades trail bike and his handle bar is 1" lower than his seat. he is 5'7"tall and 160 lbs heavy. we tried to lower his saddle pero ganun pa rin ang complaints nya.
any help will be greatly appreciated.tnx!
I LOVE my bike just like how the MONKEY loves a banana!
What is the size of the Stem he's using? the Top tube is only 21 3/4"(2004 model), its not that long but then again maybe your friend have shorter torso. But if its an older model 17"; 22 1/2" (2003) well thats a bit long.
You guys can try fiddling with the stem sizes and angle, maybe the current setup makes him to lean too much thus causing the lower back pain. Try dealing with the bikeshop where he got the bike to try out various stems to spot on where he is more comfortable.
Last Edit: Oct 26, 2004 8:52:51 GMT 8 by warlock^_^
you can also advise him to get off the saddle when riding over bumps...to vary his riding position every now and then....to lower the nose of his saddle a bit to place more weight on his shoulders and arms rather than on his butt.
he can also adjust the spacers on his steerer tube to raise his stem and consequently his bar. his 2" riser bar, is it angled away or towards the rider? maybe he needs to make sure its towards the latter too.
also, while biking, can your friend straighten out his back comfortably? like maybe somewhere at least 70-80 degrees relative to the ground? like in more of a trail riding position? if not, his bar is probably too far forward as suggested by warlock...as in a XC race position...stressful sa likod yun lalo na pag dehins masyadong flexible yung katawan.
does he wear a backpack while commuting? those things can be murder if too heavy or improperly fitted and you're leaning forward.
i'm 5'8" and used to ride a 17" HT frame w/ a 90mm x 5 degree stem and a 2" riser bar...would often get back pains on ordinary road rides.
i changed bikes, got a 15.5" HT frame, used a 100 mm x 5 degree stem w/ a 1" riser bar...and the back pains disappeared. this frame's effective top tube length was also about an inch shorter than the previous hardtail.
it takes some experimentation to get your proper fit on your own. good if you can do it at the shop, but for me, things didn't show up till i had several hours on the bike
to recap, what warlock and woofer are saying, is probably the first thing you need to change, your stem length. a 110mm stem length according to some people i've spoken with, would be good for riders 5'9"- 6'3"...not sure if that's a hard and fast rule but think it's a good indication of what your stem length should not be
Just may add.. Based on his height .. he should use 16" frame. The stem would be 100 or 110 m. If he use a riser bar he should use 0" or 5" rise.
Lower back pain could be coming from something else. Biking sometimes will irritet more. The other cause is weak lower back muscles and heavy stomach (malaki and tiyan) but this will vary to person to person because I excercised my lower back and to lots of set up but have same similar problem just ignoring it.
I think we all have the same thing in mind... ;D ;D ;D
Mountain bicyclists are subject to various traumatic and overuse injuries. Traumatic injuries range from minor abrasions and contusions to wrist fractures, shoulder injuries, and concussions. Helmet use is important in preventing serious head trauma. Many overuse injuries stem from improper bike fit, anatomic malalignments, and training errors. Treatment includes adjustments to the bike and modification of training habits.
Overuse injuries in off-road cyclists are related to interactions between the cyclist's body, the bicycle, and the terrain on which they ride. The effects of anatomic variations and small errors in bike fit are magnified by long hours spent riding and by highly repetitive lower-extremity motions. A combination of these factors is usually responsible for overuse injuries of the lower extremity.
Training errors frequently contribute to overuse injuries. The abundance of hills available for off-road riding can easily tempt a rider to push beyond his or her established level of conditioning, especially early in the season. Common training errors include inadequate preseason conditioning, riding in too high a gear by overrelying on the large chainring, and suddenly increasing mileage, hill climbing, or riding intensity.
Common Mountain Biking Overuse Injuries, Bicycle-Related Causes, and Suggested Adjustments
Low-back pain due to 1. Excessive vibration --> Use wider tires and/or lower inflation pressure; consider adding or adjusting front suspension 2. Incorrect reach --> Check upper-body position; consider decreasing reach if cyclist is too far forward or if pain is related to extension on physical examination; increase reach if upper body is crowded or if pain is related to flexion on exam 3. Incorrect saddle position --> Ensure proper saddle position (see "How to Fit a Mountain Bike" by Mad_doc) 4. Low-back inflexibility --> Raise handlebar or change to upright handlebar
Ref: Mountain Biking Injuries: Fitting Treatment to the Causes: Robert Kronisch, M.D., The Physician and Sports Medicine - VOL. 26 - NO. 23 –March 98
Last Edit: Oct 26, 2004 11:09:02 GMT 8 by minotaur
"If you think about it, mud is just wet dirt." -Homer Simpson
thanks for all the ideas! its very informative and i'll tell my friend asap.
my friend rides about 12kms (one way) a day and he works as an elementary grades teacher kaya magaan lang trabaho, with a slight bulge and regularly does bed exercise ung repetitive horizontal hip thrusts kaya calloused knees is not a problem ;D
thanks a million!
I LOVE my bike just like how the MONKEY loves a banana!