Rail - Dropper post

[Good Times]

Anyone fitted a longer travel dropper? Wondering if the seat tube will allow for it...

 

[p3eps]

Longer than...?
Mine has a 170 in a Large. How long do you want to go?

 

[Good Times]

My large has a 130mm standard. So longer than that!!

 

[p3eps]

The 9.9 Large comes with 170 as standard. Not sure why another Large model would only come with 130?

 

[Doomanic]

That's the "Dentist Spec" Rail, us mere mortals have to make do with 130mm on all sizes.
Rail 7:

 

[p3eps]

That's the "Dentist Spec" Rail, us mere mortals have to make do with 130mm on all sizes.
Rail 7:
View attachment 25812

Weird! I get that they’d not put an AXS dropper on lower specs, but I thought they’d have done the same size?
I had about 2cm of the post out when fully dropped, so I see why you’d want to change from 130.

 

[Doomanic]

I’d like to get a 150 for mine, I think 170 might be pushing it a bit. I’ll have to measure how much post is sticking out from the seat tube.

 

[zaykay]

I swapped the short stock dropper to 180mm long One Up v2. What I have measured I could actually use even the longest 210mm model. There is enough insertion depth on large size frame for it. Might upgrade to that later.

 

[Randomscruff]

Might be handy for other Rail 7 owners.

 

[Good Times]

Exceptionally helpful guys, thanks so much. Let’s go shopping!!!

 

[WilkyWay]

I swapped the short stock dropper to 180mm long One Up v2. What I have measured I could actually use even the longest 210mm model. There is enough insertion depth on large size frame for it. Might upgrade to that later.

Very useful information. My Large Rail 7 has the 130mm one. Set it to the right height for climbing and it’s not far enough out the way when it’s dropped, nearly been bucked a couple of times because of it. I was going to change to a 170mm ish post but I thought they may have fitted a short one because a long one wouldn’t fit all the way in. Ideally I’d want it inserted all the way into the collar.

 

[Hannibal]

In my short experience so far on my rail 7..... I manually lowered my seat on my 7 as I felt 130 was a bit silly as the nine has 170.... but when your steep enough to drop the post that much you end up with the wheel up your arse anyway so I’m not sure it’s worth getting a bigger drop. That was my conclusion on root canal at Aston hill anyway.

 

[WilkyWay]

FYI I have just put a none dropper seat post into my 7 in Large. the seat tube will allow for around 280mm of penetration, for anyone interested.

 

[Philly G]

FYI I have just put a none dropper seat post into my 7 in Large. the seat tube will allow for around 280mm of penetration, for anyone interested.

Sounds like a Bike Yoke Divine 185mm might just fit? Total insertion length to bottom of actuator is 289mm, but you can rotate the actuator to help it fit. Tight, but OK I think?

 

[Tony.OK]

Sounds like a Bike Yoke Divine 185mm might just fit? Total insertion length to bottom of actuator is 289mm, but you can rotate the actuator to help it fit. Tight, but OK I think?

Just fitted a 180mm Oneup in my Med 9 no problems, much better!

 

[Philly G]

Just fitted a 180mm Oneup in my Med 9 no problems, much better!

Cool, the 180mm OneUp has max insertion of 267mm, so if you got that into your medium frame no problem, the 185mm BikeYoke should be fine on the large frame ?

 

[Stanpipe]

I’ve got the 210mm One-Up dropper in a Large Rail 9. 33” inside leg and post just fitted to where I needed it.

 

[Philly G]

I’ve got the 210mm One-Up dropper in a Large Rail 9. 33” inside leg and post just fitted to where I needed it.

So just to be clear, do you have it fully inserted into the frame?

 

[Stanpipe]

So just to be clear, do you have it fully inserted into the frame?

No, still 40mm clear for my legs!

 

[Stanpipe]

This gives me 915mm from top of pedal at 6 o’clock to top of saddle. This is what fits my body. It’s not the Min insertion you need (we know that fits), it’s how much post you need in the frame for your legs. I’m 33” inside leg. I’d measure what you run at mo (at full extension) and then measure what you need from pedal to top of saddle.

 

[Stanpipe]

Just FYI I run 305mm from top of seat collar to top of saddle. That still leaves the 40mm of lower post above the collar. I could prob only lower another 4-5mm before it hits the kink in seat tube. Hope this helps.

 

[Philly G]

Just FYI I run 305mm from top of seat collar to top of saddle. That still leaves the 40mm of lower post above the collar. I could prob only lower another 4-5mm before it hits the kink in seat tube. Hope this helps.

Thank you for all the info and photos! This is exactly the information I need. ?

 

[Branny21]

i have a 9.7 size large and fit a One up 210 dropper. Where i have it i could lower it about another 10mm. Its awesome. so the lowest i could put it is with the seat collar of the dropper about 10mm above the frame

 

[Philly G]

i have a 9.7 size large and fit a One up 210 dropper. Where i have it i could lower it about another 10mm. Its awesome. so the lowest i could put it is with the seat collar of the dropper about 10mm above the frame

That's great! The 210 oneup has a max insertion of 297mm vs 289mm for the 185 bike yoke, so I'm certain I can run the Bike Yoke fully inserted. The actuator can be rotated as well to gain extra clearance. Pulled the trigger on the Bike Yoke yesterday, so will post pics of how I get on!

 

[Philly G]

Bike Yoke 185mm fits easily

into large frame, fully inserted. Didn't need to rotate the actuator to make it fit. I do get some tyre buzz though, just on my hip pack. It's my first 29er though, so could be I'm just getting used to the bigger wheels

 

[BiGJZ74]

I’ve got the 210mm One-Up dropper in a Large Rail 9. 33” inside leg and post just fitted to where I needed it.

Can the 210 be inserted fully down to the collar? I'm currently running a oneup 180 but at my preferred climbing height, at full drop its a bit higher than I prefer....if its at the right drop height.....extended it's too low. I had the same issue on my Orbea rallon and the 210 was the perfect fit

 

[dixie600mhz]

Just in case it helps anyone, I'm 5' 10' with 32 inseam and the 170mm bontrager dropper was just right for me with the stock seat when fully extended. I swapped seats to ergon coreplus that turned out to be a bit thicker so the 170mm was just too high with the post all the way down into the frame. Luckily Bontrager have copied one up and now sell shims to limit dropper travel. They come in 10mm or 30mm size. You can only use one at a time but can trim them down if needed, to get the perfect extended height with the bontrager elite dropper posts. I still love the oneup seatpost on my canyon too.

 

[dypark]

Does anyone have measurement info for a Rail 9.7 in a Small frame? I'm hoping to move up to a 150 mm dropper from Oneup with the tube down all the way to the collar. Oneup lists an insertion depth of 237. Bike comes with a 100 mm dropper with a listed max insertion of 210.

 

[irie]

Does anyone have measurement info for a Rail 9.7 in a Small frame? I'm hoping to move up to a 150 mm dropper from Oneup with the tube down all the way to the collar. Oneup lists an insertion depth of 237. Bike comes with a 100 mm dropper with a listed max insertion of 210.

From memory the OneUp dropper cable attachment is 15mm but the Bontrager cable attachment is 27. 7mm so there's more than 12mm to play with. I put a OneUp 180 dropper (without shims) in my Trek Rail 5 Large and it fitted with room to spare in spite of the fact that using Trek's insertion lengths the Oneup dropper site recommended shimming to 160mm

 

[BiGJZ74]

From memory the OneUp dropper cable attachment is 15mm but the Bontrager cable attachment is 27. 7mm so there's more than 12mm to play with. I put a OneUp 180 dropper (without shims) in my Trek Rail 5 Large and it fitted with room to spare in spite of the fact that using Trek's insertion lengths the Oneup dropper site recommended shimming to 160mm

FAQ on insertion depths for the rail are wrong. When I got my 2020 Rail 7, the Trek Chart said large was 300mm. I run a 210mm Oneup v2 slammed to the collar on my Rail 7.