Dropper post help
Discussion
I want to get a dropper post for the mountain bike, I've looked online at the calculations and it's got me all confused.
Has anyone got an easy way of figuring out what size i need? It's for a 16" frame on a Boardman full suspension.
I was going look at 2nd hand ones with internal routing
Don't want to buy the wrong one, which doesn't fit or give the wrong amount of drop
Has anyone got an easy way of figuring out what size i need? It's for a 16" frame on a Boardman full suspension.
I was going look at 2nd hand ones with internal routing
Don't want to buy the wrong one, which doesn't fit or give the wrong amount of drop
Frames size is irrelevant. The seatpost diameter is the important one. Usually one of three 27.2, 30.9, 31.6. My Boardman HT had 31.6 but check the specs on the Halfords website. The length and amount of drop depends on how tall you are. Generally speaking the taller you are the more drop you need. As for internal routing. This is only any use if your frame has internal routing which I'm pretty certain the Boardman doesn't have.
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Paul - disagree, frame siz is entirely relevant in selecting the right post length & drop.
As above, The thing to do is set your current bike in your riding position and measure from top of seat tube/clamp, to the RAILSs.
Then use this to work out what drop you can fit.
For instance - on my 19" frame, I can only JUST fit the Reverb 125mm dropped in.
On the 17" frame I have enough room to fit the new 150mm Reverb.
Both of these give exactly the same saddle>cranks distance though.
For what is worth, the min clamp to saddle rail distance on a 125mm Reverb is 195mm. The KS posts come up slightly shorter for the same drop.
Finally, for a Reverb stealth, the distance needed below the post for the hose strain relief is larger than the non-stealth - this can interfere with inserting the post into the frame and routing the hose. I have had to remove the hydraulic dry-break connection on my reverb stealth and fit the standard shorter version to fit low enough into my frame.
If all this is off-putting, it shouldn't be - its worth it when you get it right. Just do your research and measurements.
As above, The thing to do is set your current bike in your riding position and measure from top of seat tube/clamp, to the RAILSs.
Then use this to work out what drop you can fit.
For instance - on my 19" frame, I can only JUST fit the Reverb 125mm dropped in.
On the 17" frame I have enough room to fit the new 150mm Reverb.
Both of these give exactly the same saddle>cranks distance though.
For what is worth, the min clamp to saddle rail distance on a 125mm Reverb is 195mm. The KS posts come up slightly shorter for the same drop.
Finally, for a Reverb stealth, the distance needed below the post for the hose strain relief is larger than the non-stealth - this can interfere with inserting the post into the frame and routing the hose. I have had to remove the hydraulic dry-break connection on my reverb stealth and fit the standard shorter version to fit low enough into my frame.
If all this is off-putting, it shouldn't be - its worth it when you get it right. Just do your research and measurements.
Snotrag is exactly right. This is the only way to measure for a dropper post.
From the rails to the top of the seat tube.
This measurement will be stated (or found out) for all droppers. Once you have your distance go look at the post you want in say 125mm drop and check if that distance is less than or equal to your measurement. Remember if it is less on the post itself you can always move the post up a bit to reach you full ride height. But if it is too long, you cant shorten the dropper from its fully extended height.
It sounds complicated, but once you have that measurement half your problems are over.
Is this for your Boardman? I got a KS eTen 125mm for mine, fits nicely. Remember when fitting though measure twice cut once!
From the rails to the top of the seat tube.
This measurement will be stated (or found out) for all droppers. Once you have your distance go look at the post you want in say 125mm drop and check if that distance is less than or equal to your measurement. Remember if it is less on the post itself you can always move the post up a bit to reach you full ride height. But if it is too long, you cant shorten the dropper from its fully extended height.
It sounds complicated, but once you have that measurement half your problems are over.
Is this for your Boardman? I got a KS eTen 125mm for mine, fits nicely. Remember when fitting though measure twice cut once!
Dropper posts are great but don't fall for the must have a huge drop that people seem to think necessary. I have 2 reverb stealths and they have been faultless, would recommend - they come with collars to limit drop. I say don't over do it with drop as I really think the big drop thing is 'just cause you can'. It doesn't mean it's good. Just look at seat height in the DH World Cup, no one rides with the saddle slammed.
Ive a 125 dropper in my medium stumpy, basically thats what its specced with.
In honesty I could have done with a 100 as Ive had to remove a little of the excess tube to get it to seat as far down as possible - the stumpy frame has a large curve just above the crank.
Ive managed to make it work for me, but due to the frame it would not slide home completely.
Also check see if you can have internal routed cables. Check if you have holes to push the cable through otherwise its external only.
Fantastic things to have, once you have one you wonder why you didnt get one earlier!
In honesty I could have done with a 100 as Ive had to remove a little of the excess tube to get it to seat as far down as possible - the stumpy frame has a large curve just above the crank.
Ive managed to make it work for me, but due to the frame it would not slide home completely.
Also check see if you can have internal routed cables. Check if you have holes to push the cable through otherwise its external only.
Fantastic things to have, once you have one you wonder why you didnt get one earlier!
With these feet said:
Ive a 125 dropper in my medium stumpy, basically thats what its specced with.
In honesty I could have done with a 100 as Ive had to remove a little of the excess tube to get it to seat as far down as possible - the stumpy frame has a large curve just above the crank.
Ive managed to make it work for me, but due to the frame it would not slide home completely.
Also check see if you can have internal routed cables. Check if you have holes to push the cable through otherwise its external only.
Fantastic things to have, once you have one you wonder why you didnt get one earlier!
Yeah there is a hole at the bottom of the frame for the cable.In honesty I could have done with a 100 as Ive had to remove a little of the excess tube to get it to seat as far down as possible - the stumpy frame has a large curve just above the crank.
Ive managed to make it work for me, but due to the frame it would not slide home completely.
Also check see if you can have internal routed cables. Check if you have holes to push the cable through otherwise its external only.
Fantastic things to have, once you have one you wonder why you didnt get one earlier!
I think I'll measure how much seat is on show when it's fully down and work out what I can have
The_Jackal said:
I would say the price you are paying for a dropper post you might as well not leave yourself short in the future.
My measurement was 185 I think, so a 125mm KS eTen would be fine for you.
You have a Large (19") frame - non?My measurement was 185 I think, so a 125mm KS eTen would be fine for you.
Got a pic of the dropper fitted, at raised and lowered positions?
I was going to get a reverb (just because its the only one ive heard people talk about) but am interested in alternatives.
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