Bike Assembly Failure
#1
Thread Starter
Junior Member
Joined: Jan 2021
Posts: 8
Likes: 0
Bike Assembly Failure
Hi everyone, thank you for reading this post.
I really hate to ask but I have looked through the generic Mongoose manual and watched a Mongoose handlebar assembly online and am kind of stumped. I have a Switchback Comp 27.5 (Women's if it matters) and despite it being 95% assembled I somehow cannot put the last 5 or so pieces on. To me, it looks like what I think is the clamp, is oriented incorrectly just based off looking at a picture of my bike on their website. My first concern was that it was offcenter and I couldn't adjust it just by holding the fork and manually adjusting with my hand, so I unscrewed the removable part of the clamp, removed it, and took two more screws out so that the only thing left was what I think is the screw for the top cap. It looks to me like the clamp is on completely backwards, and I could not remove what I think is the top cap even with considerable effort. I believe I have all the parts and wish I could post pictures but as a new user I cannot.
What do you think I am doing wrong and how much would be fair price for me to pay to have a bike shop help me out as last resort, given that the only things not assembled is the actual handlebar as one piece, the two pedals, and a skinny metal part that honestly I'm not sure what it is.
I would post pictures but as a new user I am not allowed.
Thank you so much.
I really hate to ask but I have looked through the generic Mongoose manual and watched a Mongoose handlebar assembly online and am kind of stumped. I have a Switchback Comp 27.5 (Women's if it matters) and despite it being 95% assembled I somehow cannot put the last 5 or so pieces on. To me, it looks like what I think is the clamp, is oriented incorrectly just based off looking at a picture of my bike on their website. My first concern was that it was offcenter and I couldn't adjust it just by holding the fork and manually adjusting with my hand, so I unscrewed the removable part of the clamp, removed it, and took two more screws out so that the only thing left was what I think is the screw for the top cap. It looks to me like the clamp is on completely backwards, and I could not remove what I think is the top cap even with considerable effort. I believe I have all the parts and wish I could post pictures but as a new user I cannot.
What do you think I am doing wrong and how much would be fair price for me to pay to have a bike shop help me out as last resort, given that the only things not assembled is the actual handlebar as one piece, the two pedals, and a skinny metal part that honestly I'm not sure what it is.
I would post pictures but as a new user I am not allowed.
Thank you so much.
#2
Disco Infiltrator




Joined: May 2013
Posts: 15,345
Likes: 3,542
From: Folsom CA
Bikes: Stormchaser, Paramount, Tilt, Samba tandem
This should help. Stems or the entire fork are frequently turned backwards for shipping because it makes for a shorter box.
https://www.parktool.com/blog/repair...ion-threadless
https://www.parktool.com/blog/repair...ion-threadless
#3
Senior Member

Joined: Oct 2016
Posts: 4,179
Likes: 1,294
From: San Mateo,Ca.
Bikes: TRIMMED DOWN THE HERD
Are you talking about the stem? The part that connects to your steerer tube and your handlebar?
https://cdn.shopify.com/s/files/1/00...g?v=1605018675
The order to tighten that is first you preload the top cap but make sure your fork steers freely. Then when you think it feels right, you center the stem then tighten the two bolts.
You can upload your pics to your members album.
https://cdn.shopify.com/s/files/1/00...g?v=1605018675
The order to tighten that is first you preload the top cap but make sure your fork steers freely. Then when you think it feels right, you center the stem then tighten the two bolts.
You can upload your pics to your members album.
#4
Thread Starter
Junior Member
Joined: Jan 2021
Posts: 8
Likes: 0
Hi, I read this guide but the issue is that it glosses over removing the bolt from top cap as if there is no resistance. The bike came shipped like this- I haven't managed to move that bolt a bit and am afraid to strip it. Do I need a drill or should I just try harder?
#6
Advanced Slacker

Joined: Feb 2017
Posts: 6,286
Likes: 2,602
Bikes: Soma Fog Cutter, Surly Wednesday, Canfielld Tilt
All the top cap does is push the stem down onto the headset tight enough to take out any play. THEN you tighten the bolts on the side of the stem to lock the stem in place on the steer tube. At that point you could remove the top cap altogether and it would make no difference.
Unfortunately, you are using terms like "the clamp" and I have no idea what you are talking about. Look up terms like "steer tube (AKA steerer)", "stem", "top cap", stem bolts" and "stem face plate" and try to be more specific about what you are talking about. I know it is not easy when you don't know where to start, but I think those terms should clear up a lot of things.
#8
Senior Member
Joined: Feb 2015
Posts: 6,006
Likes: 2,286
From: Mission Viejo
Bikes: 1986 Cannondale SR400 (Flat bar commuter), 1988 Cannondale Criterium XTR, 1992 Serotta T-Max, 1995 Trek 970
As mentioned above, you have a threadless headset/stem, so if you look at videos, and there are a lot of them, you need to look for one that shows you how to adjust the headset and stem.
John
John
#9
Senior Member
Joined: Dec 2019
Posts: 2,841
Likes: 1,062
From: South Shore of Long Island
Bikes: 2010 Carrera Volans, 2015 C-Dale Trail 2sl, 2017 Raleigh Rush Hour, 2017 Blue Proseccio, 1992 Giant Perigee, 80s Gitane Rallye Tandem
So it sounds like someone tightened the top cap too much or when the stem was tightened down it also tightened around the inner lip of the top cap which I've seen happen.
If you want to adjust the stem there are two bolts, one above the other and they may be facing opposite directions. They will both be below the top cap and are what clamp the stem to the bike. Loosen these and the top cap should be easy to loosen. If the fork is hard to turn side to side or feels tight when you do so that is a sign the top cap was twisted too tight, loosen it a little, if you can move the fork easily the top cap isn't too tight, just position the stem and retighten the two stem bolts.
If you want to adjust the stem there are two bolts, one above the other and they may be facing opposite directions. They will both be below the top cap and are what clamp the stem to the bike. Loosen these and the top cap should be easy to loosen. If the fork is hard to turn side to side or feels tight when you do so that is a sign the top cap was twisted too tight, loosen it a little, if you can move the fork easily the top cap isn't too tight, just position the stem and retighten the two stem bolts.




