Could my bike a size too large be the cause of my back problems....twice now after riding my Boardman TXC 29r Ezee conversion I have experienced severe lower (right) back pain. It seems that an age old problem is resurfacing...so I am now quite scared to go for a ride. I don't really know what the actual size of the frame is but with the seat fully down I can barely touch the ground No problems when riding the old Forza. If I cannot sort this out then the bike is available for sale. I paid John £950 and will accept £900.

Before you despair, try swapping the saddles.

Before spending any money make sure the bike is set up properly for you. Make sure the saddle is the right height, at the right angle and correctly positioned fore and aft. There are plenty of videos on YouTube that show you how to do this.

 

If you are getting pain on one side it sounds like your saddle may be too high.

I would say that it's not so much the size, but the shape. It's holding you in just the wrong position that's aggravating your back. Try different handlebars or stem, or put the seat higher, or a stem riser until you find a position that doesn't give you the problem.

 

I've had to deal with lower-back problems, which are bad on a city-type bike but give me no problems on a road bike with seat high and bars low, which seems counter-intuitive.

and a suspension seatpost,

 

and a pair of upswept handlebars, possibly a riser as well,

 

had to go through all these before i got any sort of comfort.

Usually, with an over-large frame the problem is with the top-tube being too long and causing the rider to have to raise up the head in order to see. This certainly causes neck problems and upper back pain and especially if ridden long distances.

If the saddle is at the correct height then it should be possible to sit on the saddle and reach the ground with the ball of the foot only.

thank you for all the suggestions....I did try the big bum seat off the Forza but probably did not ride long enough to fully test. Looked at the thud buster quite expensive....any thoughts on suspension seatposts ?

Suntour NCX seatpost.

 

Suspension seatposts need a little extra height so the seat will not go as low as with current seatpost.

Usually, with an over-large frame the problem is with the top-tube being too long and causing the rider to have to raise up the head in order to see. This certainly causes neck problems and upper back pain and especially if ridden long distances.

If the saddle is at the correct height then it should be possible to sit on the saddle and reach the ground with the ball of the foot only.

I think you meant reach the pedal with the ball of the foot only....but thanks to all for your help - I am going to have a rethink about saddles height etc...

Almost anything can set off the backpain. Check whether the saddle is directly aligned, or the handle bars exactly square. Some people prefer the saddle canted either towards the front or rear. My understanding is that a foot should reach the ground while sitting on the saddlesadd the bike slanted at about 30 degrees .

 

In contrast with d8vh, I have found the sit up and beg stance of the Dutch bike the better... At least for my neck. I did get backpain on an early occasion sitting upright, but I was sitting rigid not relaxed going over cobbles.

Get someone to ride behind you. If your hips are rotating around the saddle, then it is too high. If you're getting a burn just above the knee it is too low. If you're comfortable with the amount (or lack ) of weight on your wrists, then I'd say the reach is right.

Frame size is measured from centre of bottom bracket to the top of the saddle stay.

I too suffered from right side sciatic type pain. Went to a sports masseur and he found problems in my left shoulder/upper back and right calf. After 4 treatments - never looked back (pun:rolleyes:). The problem may not be where you think it is.

Just ordered the Suntour SP12 NCX suspension seat post and will report back on results....thanks again everybody....

I ride sit up and beg style on both my bikes.

I find this fine whereas with flat bars and leaning forward I used to get pain in the stomach and groin.

Opposite of d8veh!

Have a read in here https://electricbikereview.com/forum/threads/pain-in-the-neck-and-back-wrong-frame-size.16025/

 

I found the more upright position took the weight off the shoulders and wrists as well which were giving discomfort after a couple of miles,

not very aerodynamic and all that but another plus is you get to see much more of the countryside rather than being head down and bent over

I have noticed that In Belgium, quite a lot of the older 40 plus riders have high handlebars, some, to be accurate if indelicate, at nipple height.

Riding with 2 bulging discs I've found It's best for me to ride upright.

Short of actualy buying a Dutch style bike , I have a few changes I make to any new bike.

NCX seatpost, 3 inch rise bars & a realy short stem (40mm)

Not forgetting a wittkop medicus trekking saddle from lidl (previous years lidls have had bike accessories on sale in early March)

Could my bike a size too large be the cause of my back problems....twice now after riding my Boardman TXC 29r Ezee conversion I have experienced severe lower (right) back pain. It seems that an age old problem is resurfacing...so I am now quite scared to go for a ride. I don't really know what the actual size of the frame is but with the seat fully down I can barely touch the ground [ATTACH]23363[/ATTACH] No problems when riding the old Forza. If I cannot sort this out then the bike is available for sale. I paid John £950 and will accept £900.

It's my opinion that your bike is to big, you should always have some seat pin showing,and sitting on the saddle ,with your leg slightly at the knee, with the ball of your foot centrally on the pedal, you should also be able to have both feet be able to touch ground with your toes.

Another important rough guide , is to have the saddle in the mounted in the pin ,flat, then you should be able to place your elbow on the nose of the saddle ,extend your forearm to the handlebars, where your finger tips are should be the centre line of the handlebars ,if they are short then it's a fair bet the frame is too big.

Fingers forward is ok ,fingers behind means you will be stretched, making your back ache.

Of course this is only a general rule, but I reckon you need to sell on ,otherwise you will be wasting time and money trying to make your current one fit.

Suntour NCX seatpost.

 

Suspension seatposts need a little extra height so the seat will not go as low as with current seatpost.

 

faith restored - purchased and fitted the Suntour NCX. As it turned the height was about the same as the rigid seatpost. Thinking there was rain on the way this afternoon headed out quite early and completed 22 miles including Box Hill twice. No problems whatsoever...Bike comfort is transformed on a softer setting.

 

On a different subject I was having a lot of trouble with the gear indexing. Threw out the Sram and fitted a Shimano 9 speed shifter. Now gear changes are like silk....

I have considered the NCX seat post but dismissed the idea on the basis that when the seat post compresses (as it must do continually on uneven surfaces?) it will alter the saddle height relative to the pedals and potentially give rise to knee problems. Or am I missing something?

I have considered the NCX seat post but dismissed the idea on the basis that when the seat post compresses (as it must do continually on uneven surfaces?) it will alter the saddle height relative to the pedals and potentially give rise to knee problems. Or am I missing something?

 

 

The seat post is compressed under your dead weight and has slight movement going over bumps and hollows... The knee is very flexible in forward backwards movement so can easily adjust, provided the height on average is correct, there wouldn't be fatigue. There are always as many bumps as hollows on average.... , Otherwise it's a slope.

Sorry but you have lost me there. Does the NCX seat post convert up and down movement to forwards and backwards movement? Either way the change in geometry can't be good for one's knees. Unless, that is, one stops pedalling when bouncing?

It doesn't bounce, it absorbs the shocks, the pogo stick ones bounce. It does move slightly forwards but not enough to change your riding position. They really are the best invention since the bicycle IMO...

They are a parallel arm mechanism that moves in an arc backwards/down as weight comes on and forwards/upwards to return. So, because of the arc, I think the relative distance from bum to peddle is pretyy much mantained. Your bum might be slightly loer but also slightly further back. The motion is a little discocerting at first but you soon get used to it.

Sorry but you have lost me there. Does the NCX seat post convert up and down movement to forwards and backwards movement? Either way the change in geometry can't be good for one's knees. Unless, that is, one stops pedalling when bouncing?

Sorry I lost you.. what I was saying is that the knee has no problem with up down movement so if the saddle move up down so what! Normally we adjust the saddle so that the ball of the foot pushes down at near full extension on the pedal, at he bottom of the power stroke and the knee is nearly bent at the start of the stroke.

If the seat moves up and down a little so what... On average it's at the optimum point...

Side ways movement of the knee , however is very painful and expensive to repair as many footballers know to heir cost

Sorry but you have lost me there. Does the NCX seat post convert up and down movement to forwards and backwards movement? Either way the change in geometry can't be good for one's knees. Unless, that is, one stops pedalling when bouncing?

Actually it moves slightly backward and downward when going over bumps..but there is no real perception of this movement and the seat maintains it horizontal position ... I do not think it would cause any knee problems... but I have only one ride with it so dont really know...