Jump to content

CB125F lowering


Recommended Posts

Right a serious question for once.   Now you all know how bike obsessed Chloe my youngest daughter is.    Well she is tiny 5’1” and her CB125 has her right on her tip toes in standard form.   
I have just had the seat sculpted by 2” or 50mm but she still struggles to get the balls of her feet down because of the bikes width.  
I have looked at lowering the front forks in the yoke but that’s not easy as the are only pinch bolts in the bottom yoke, so not really an option unless the were a custom top yoke to replace the top one where the forks actually bolt in.  
So I’m thinking some lower rear shocks to bring the seat down although I know the steering geometry will be effected I’m hoping there is still the option of sneaking 25mm to 50mm. 
The standard rear shocks are set to their lowest rebound but Chloe is too light for any suspension sag to help out.  
The standard rear shocks measure 335mm pin to pin whereas they are listed as 345mm by suppliers.   I have found a set of shocks for a YBR125 on EBay that look right with the right pin size and they are listed at 310mm.    They are only £44 a pair so I am thinking this could be the answer. ?  
 Custom seat.  
IMG_2738.thumb.jpeg.8087b42b31c12f8cc59283bbce500d8e.jpegIMG_2734.thumb.jpeg.13593d72e18c87746902d7265968016a.jpegIMG_2737.thumb.jpeg.4e648b549e42c5c4745ca6ecd55ddc8a.jpeg

https://www.ebay.co.uk/itm/116102078631?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D259211%26meid%3Dad4105dc1a414b5fb4940b98a213298d%26pid%3D101196%26rk%3D3%26rkt%3D7%26sd%3D144679598671%26itm%3D116102078631%26pmt%3D1%26noa%3D0%26pg%3D4429486%26algv%3DSimplAMLv5PairwiseWebWithBBEV2bAndUBSourceDemotionWithUltimatelyBoughtOfCoviewV1&_trksid=p4429486.c101196.m2219&itmprp=cksum%3A116102078631ad4105dc1a414b5fb4940b98a213298d|enc%3AAQAJAAABUKAGZatwWrSFioKhyF05YYps7xtgOI2Vu0BqB4BERv%2FNTfrUNkP50TZAJfREiGj7R%2BA2x2E5zTqSs43jfR6uCcmt8%2B%2BTUdobg9SfOq%2BIqjUBsMC43q52NIb9OO%2By06BpV6mD6PW6%2Fr6C2t7t154ja88MhM1Zguc%2FD%2Foq3nSJJqMB9rEvJxPlsyKcS7H4JJmIFxsBx5mghJPYINK5F%2BUamfJJQBYNcEPrUWDUYlEibh28GZfNIFNLiUbFsR%2FcTntJCM3AvhDxBvlB7f5KUaZ1eKjvOQ%2BA6WUwExB98j9cglqvch9kIEeYW5SajIieHB8CqXs7J0uB0cXznS1UqJxN4xONbiUt4NfMV2Mk9pK15RSZleUgQkh3pRBZOWnU8oYEBVuwHh%2F23dzgLF%2FLva3FmlaAkYn%2BUGbjxrCtBCQxxQ%2BKXinv1qxaxFzW%2F1h%2FtkEujA%3D%3D|ampid%3APL_CLK|clp%3A4429486&itmmeta=01J1J4GNTJNH58YHATE97C0GJE

 

  • Like 1
Link to comment
Share on other sites

Not trying to be funny, but have her sit on it wearing track bottoms or anything like that, slippery and stretchy, and see if it helps, her jeans seem tight.

If I sit on my bike with normal jeans I become quite shorter than when wearing riding jeans or motorcycle pants. A pair of nice riding jeans like Dainese that have a little stretch in that area might help before changing the bike.

Can’t understand how you can’t lower the front too, do the forks not go across the top yoke?

  • Like 1
Link to comment
Share on other sites

Shorter fork springs and shave the tubes. Smaller wheels or lower profile tyres? 

  • Like 1
Link to comment
Share on other sites

14 hours ago, Pedro said:

Not trying to be funny, but have her sit on it wearing track bottoms or anything like that, slippery and stretchy, and see if it helps, her jeans seem tight.

If I sit on my bike with normal jeans I become quite shorter than when wearing riding jeans or motorcycle pants. A pair of nice riding jeans like Dainese that have a little stretch in that area might help before changing the bike.

Can’t understand how you can’t lower the front too, do the forks not go across the top yoke?

I’m not sure how much you know about teenager fashion but everything she has is stretchy and spray on, I do take your point about bike jeans but that’s not the issue in her case.  

Here is a picture of the top yoke, the fork tubes are bolted into it.  So without finding a traditional one with pinch bolts or having it modified or something custom made it’s not really the first option.   
IMG_2739.thumb.jpeg.1bfe8f01599b74a08f13a1ab4c00efb8.jpeg

Shorter forks springs and shaving the tubes maybe an option but I’m going to try the shorter shock’s first.   
I do also take the point about smaller wheels but that maybe a sledgehammer to crack a nut and probably not a cost option in this instance.  

Link to comment
Share on other sites

If you lower the shocks but don’t touch the front all it will do is slow down the steering which isn’t a bad thing for a new rider, don’t forget to adjust the headlight aim though.

  • Like 2
Link to comment
Share on other sites

In the top of the forks is a spacer you could remove or get something shorter which will drop the front. Item No 3

image.png.8c842f322c28c88748d857e1682df89d.png

  • Like 3
  • Thanks 1
Link to comment
Share on other sites

4 minutes ago, Catteeclan said:

In the top of the forks is a spacer you could remove or get something shorter which will drop the front. Item No 3

image.png.8c842f322c28c88748d857e1682df89d.png

Wow thanks for that research, could well be the answer if the shocks alone don't do it.  It's not a massive amount needed I reckon 25mm to 35mm could be the answer for Chloe.  

  • Like 1
Link to comment
Share on other sites

1 minute ago, Saul said:

Wow thanks for that research, could well be the answer if the shocks alone don't do it.  It's not a massive amount needed I reckon 25mm to 35mm could be the answer for Chloe.  

I don't know how long that spacer is from experience so best have one out for a look, get a couple made up 25mm shorter.
I've seen people put sockets on top to get a little higher too.:classic_laugh:

  • Like 2
Link to comment
Share on other sites

1 hour ago, Catteeclan said:

I don't know how long that spacer is from experience so best have one out for a look, get a couple made up 25mm shorter.
I've seen people put sockets on top to get a little higher too.:classic_laugh:

The problem is that the fork stanchion could then over extend and completely unload the spring on bumps, that puts you in bad territory.

Link to comment
Share on other sites

In fact I would say part 3 is a preload spacer, reducing the length of that would have the effect of softening the front end which might be desirable or not.

Link to comment
Share on other sites

3 hours ago, Buckster said:

In fact I would say part 3 is a preload spacer, reducing the length of that would have the effect of softening the front end which might be desirable or not.

Kin eck Buck it's not a track bike.

Link to comment
Share on other sites

16 minutes ago, Catteeclan said:

Kin eck Buck it's not a track bike.

What are you on about? Most conventional forks use preload spacers.

Link to comment
Share on other sites

4 hours ago, JustaPor said:

Wouldn't it be better (cheaper and easier) to teach her some techniques for short riders ? 

 

In the process of doing that but confidence needs to be built, and I think lowering the bike is a viable way to help my daughter out.   

Link to comment
Share on other sites

4 hours ago, Six30 said:

Grom .. sorted

 

IMG_3537.jpeg

Don’t be silly, don’t you  think I haven’t already tried that, and a Dax and a Monkey. She has her heart set on a red CB125F.  

  • Like 2
Link to comment
Share on other sites

19 minutes ago, Saul said:

In the process of doing that but confidence needs to be built, and I think lowering the bike is a viable way to help my daughter out.   

I understand that, as a parent, you want the best for your daughter.
After seeing this topic I researched a bit and the most common opinion is to not lower your bike.

The solution for the lack of confidence is : Practice, practice, practice.
As motojitsu says : 

 

  • Like 1
Link to comment
Share on other sites

1 minute ago, JustaPor said:

I understand that, as a parent, you want the best for your daughter.
After seeing this topic I researched a bit and the most common opinion is to not lower your bike.

The solution for the lack of confidence is : Practice, practice, practice.
As motojitsu says : 

 

Easy to say not so easy to do in practice where I live and wasn't really the question I asked. 

The seat was part of customising the bike to her, I am going with lower shocks to get the balls of her feet into play, which can be reversed when she has built her confidence through practice.    I may do the forks but we shall see.  At the end of the day you can find videos to back every opinion but I know my daughter and will do what I think is best for her.  😉  

Link to comment
Share on other sites

5 hours ago, Buckster said:

What are you on about? Most conventional forks use preload spacers.

Yes they do. My point is to let her feel comfortable getting a full foot down when things go wrong. Dropping the forks through would be much better after lowering the rear but the upper clamp doesn't allow that and I doubt she'll feel the difference removing some preload. Not yet anyway.

  • Like 1
Link to comment
Share on other sites

12 hours ago, Catteeclan said:

Yes they do. My point is to let her feel comfortable getting a full foot down when things go wrong. Dropping the forks through would be much better after lowering the rear but the upper clamp doesn't allow that and I doubt she'll feel the difference removing some preload. Not yet anyway.

Well I said it might be desirable, you don’t read well do you? It may be that currently the forks are too stiff, reducing preload would soften them and allow a little more sag. On the other hand you don’t want them too soft as you are not doing anything to the rebound springs and there is only rudimentary damping so there could be an issue with oscillation being introduced. Personally I would buy a second set of forks and shorten them but I can do that.

Link to comment
Share on other sites

4 hours ago, Buckster said:

Well I said it might be desirable, you don’t read well do you? 

No I don't.

  • Haha 1
Link to comment
Share on other sites

On 29/06/2024 at 11:17, Saul said:

Right a serious question for once.   Now you all know how bike obsessed Chloe my youngest daughter is.    Well she is tiny 5’1” and her CB125 has her right on her tip toes in standard form.   
I have just had the seat sculpted by 2” or 50mm but she still struggles to get the balls of her feet down because of the bikes width.  
I have looked at lowering the front forks in the yoke but that’s not easy as the are only pinch bolts in the bottom yoke, so not really an option unless the were a custom top yoke to replace the top one where the forks actually bolt in.  
So I’m thinking some lower rear shocks to bring the seat down although I know the steering geometry will be effected I’m hoping there is still the option of sneaking 25mm to 50mm. 
The standard rear shocks are set to their lowest rebound but Chloe is too light for any suspension sag to help out.  
The standard rear shocks measure 335mm pin to pin whereas they are listed as 345mm by suppliers.   I have found a set of shocks for a YBR125 on EBay that look right with the right pin size and they are listed at 310mm.    They are only £44 a pair so I am thinking this could be the answer. ?  
 Custom seat.  
IMG_2738.thumb.jpeg.8087b42b31c12f8cc59283bbce500d8e.jpegIMG_2734.thumb.jpeg.13593d72e18c87746902d7265968016a.jpegIMG_2737.thumb.jpeg.4e648b549e42c5c4745ca6ecd55ddc8a.jpeg

https://www.ebay.co.uk/itm/116102078631?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D259211%26meid%3Dad4105dc1a414b5fb4940b98a213298d%26pid%3D101196%26rk%3D3%26rkt%3D7%26sd%3D144679598671%26itm%3D116102078631%26pmt%3D1%26noa%3D0%26pg%3D4429486%26algv%3DSimplAMLv5PairwiseWebWithBBEV2bAndUBSourceDemotionWithUltimatelyBoughtOfCoviewV1&_trksid=p4429486.c101196.m2219&itmprp=cksum%3A116102078631ad4105dc1a414b5fb4940b98a213298d|enc%3AAQAJAAABUKAGZatwWrSFioKhyF05YYps7xtgOI2Vu0BqB4BERv%2FNTfrUNkP50TZAJfREiGj7R%2BA2x2E5zTqSs43jfR6uCcmt8%2B%2BTUdobg9SfOq%2BIqjUBsMC43q52NIb9OO%2By06BpV6mD6PW6%2Fr6C2t7t154ja88MhM1Zguc%2FD%2Foq3nSJJqMB9rEvJxPlsyKcS7H4JJmIFxsBx5mghJPYINK5F%2BUamfJJQBYNcEPrUWDUYlEibh28GZfNIFNLiUbFsR%2FcTntJCM3AvhDxBvlB7f5KUaZ1eKjvOQ%2BA6WUwExB98j9cglqvch9kIEeYW5SajIieHB8CqXs7J0uB0cXznS1UqJxN4xONbiUt4NfMV2Mk9pK15RSZleUgQkh3pRBZOWnU8oYEBVuwHh%2F23dzgLF%2FLva3FmlaAkYn%2BUGbjxrCtBCQxxQ%2BKXinv1qxaxFzW%2F1h%2FtkEujA%3D%3D|ampid%3APL_CLK|clp%3A4429486&itmmeta=01J1J4GNTJNH58YHATE97C0GJE

 

I wouldn't go around and mess with the suspension..that's just my opinion...your liable to change how the bike handles...is she done growing Saul ?   I know alot a vertically challenged riders Buckster being one of them....I'd say just leave it...and she will eventually get use to it ..the seat was a good idea .🖕

Link to comment
Share on other sites

Just make sure you don't take away to much preload from the rear....I remember some years ago when messing on my dr 650 ..trying to make ride smoother....I took to much preload off...and that thing would wobble like a wet lasagna...scary has fuck...

  • Haha 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

Privacy Policy