Longer seat post and risers for a slightly too small frame? any problems with this.
#1
Zeusmeatball
Thread Starter
Join Date: Jun 2009
Location: CT
Posts: 259
Bikes: 1976 Motobecane Nomade Sprint, 1988 Specialized Rockhopper comp, 1991 Schwinn Crisscross, 2009 K2 Zed 3.2, 2011 Trek X-Caliber Gary Fisher collection
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Longer seat post and risers for a slightly too small frame? any problems with this.
I have an old Specialized Rockhopper Comp that is just a tad too small for me, I ride a 21 inch mountain bike generally and on the low end I can pull off a 19 inch with the seat post extended as far out as it can go but just stick to buying 21 inch bikes because, well, it only makes sense!
BUT
that old Rockhopper is an 18 inch frame, I am attached to the bike for whatever reason and have considered just selling it but every time I do I end up putting it back in the pile, I think that it has something to do with its the first bike that I "refurbed" since getting back into riding.
My question is, are there any issues with putting a longer seat post and some short riser bars onto it and riding it? the riser bars may not even be necessary honestly, I have ridden this bike as far as about 7 miles as it sits and is really a third bike so doesn't get ridden too often by me.
and because pictures are always fun.
Thanks for any help guys and gals.
BUT
that old Rockhopper is an 18 inch frame, I am attached to the bike for whatever reason and have considered just selling it but every time I do I end up putting it back in the pile, I think that it has something to do with its the first bike that I "refurbed" since getting back into riding.
My question is, are there any issues with putting a longer seat post and some short riser bars onto it and riding it? the riser bars may not even be necessary honestly, I have ridden this bike as far as about 7 miles as it sits and is really a third bike so doesn't get ridden too often by me.
and because pictures are always fun.
Thanks for any help guys and gals.
#2
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
If the seatpost is long enough that the minimum insertion mark is below the top of the seat tube you should be fine. There are seatposts 400 mm long or even more available and the minimum insertion marks are typically 75 mm or so from the end so you have a lot of extension available.
#3
Banned
steel tube stem riser will let you use the existing stem,
you can combine a quill to threadless adapter, instead, if you wish
sloping top tube mountain bikes have a market segment now
so there are quality, strong seat posts and,
if 27.2, the Thudbuster suspension seat posts Too..
you can combine a quill to threadless adapter, instead, if you wish
sloping top tube mountain bikes have a market segment now
so there are quality, strong seat posts and,
if 27.2, the Thudbuster suspension seat posts Too..
#4
cowboy, steel horse, etc
Join Date: Sep 2008
Location: The hot spot.
Posts: 44,842
Bikes: everywhere
Mentioned: 71 Post(s)
Tagged: 1 Thread(s)
Quoted: 12771 Post(s)
Liked 7,688 Times
in
4,081 Posts
I've been riding a tiny MTB since 1997. Love it. I knee the stem more often than on bigger bikes but still pretty rare.
I agree that the hi-rise stem on the Rockhopper would make riser bars an option, not a necessity.
DSCN1785 by Lester Of Puppets, on Flickr
I agree that the hi-rise stem on the Rockhopper would make riser bars an option, not a necessity.
DSCN1785 by Lester Of Puppets, on Flickr
#5
Zeusmeatball
Thread Starter
Join Date: Jun 2009
Location: CT
Posts: 259
Bikes: 1976 Motobecane Nomade Sprint, 1988 Specialized Rockhopper comp, 1991 Schwinn Crisscross, 2009 K2 Zed 3.2, 2011 Trek X-Caliber Gary Fisher collection
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
steel tube stem riser will let you use the existing stem,
you can combine a quill to threadless adapter, instead, if you wish
sloping top tube mountain bikes have a market segment now
so there are quality, strong seat posts and,
if 27.2, the Thudbuster suspension seat posts Too..
you can combine a quill to threadless adapter, instead, if you wish
sloping top tube mountain bikes have a market segment now
so there are quality, strong seat posts and,
if 27.2, the Thudbuster suspension seat posts Too..
I've been riding a tiny MTB since 1997. Love it. I knee the stem more often than on bigger bikes but still pretty rare.
I agree that the hi-rise stem on the Rockhopper would make riser bars an option, not a necessity.
DSCN1785 by Lester Of Puppets, on Flickr
I agree that the hi-rise stem on the Rockhopper would make riser bars an option, not a necessity.
DSCN1785 by Lester Of Puppets, on Flickr
#6
Banned
something like this? [ebay picture]
3 sizes, .833" [bmx]
22.2mm/7/8" that is what you need,
and 9/8"
I got a long Chromo 25.4/1" seatpost thru Redline, cheap, strong . chromed.
needs a clip on top for the saddle. and shim to fit the seat tube ID on the bike ,
but pretty darn strong ..
you can find those as 1" is a common shim ID to work from..
Last edited by fietsbob; 02-03-12 at 03:56 PM.
#7
Really Old Senior Member
There's about a dozen (or more?) different seat post diameters in .2MM (.008") increments!
You MUST get the proper diameter!!!!!
Rock Hoppers seat posts varied from year to year, so you can't assume they have a generic size for that model.
You MIGHT be able to find the proper diameter on bikepedia.com
I installed a 400MM post on my bike last summer for the same reason as you.
I found a NEW one for $30 on the net and the bike shop matched the price.
You MUST get the proper diameter!!!!!
Rock Hoppers seat posts varied from year to year, so you can't assume they have a generic size for that model.
You MIGHT be able to find the proper diameter on bikepedia.com
I installed a 400MM post on my bike last summer for the same reason as you.
I found a NEW one for $30 on the net and the bike shop matched the price.
#8
Zeusmeatball
Thread Starter
Join Date: Jun 2009
Location: CT
Posts: 259
Bikes: 1976 Motobecane Nomade Sprint, 1988 Specialized Rockhopper comp, 1991 Schwinn Crisscross, 2009 K2 Zed 3.2, 2011 Trek X-Caliber Gary Fisher collection
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
There's about a dozen (or more?) different seat post diameters in .2MM (.008") increments!
You MUST get the proper diameter!!!!!
Rock Hoppers seat posts varied from year to year, so you can't assume they have a generic size for that model.
You MIGHT be able to find the proper diameter on bikepedia.com
I installed a 400MM post on my bike last summer for the same reason as you.
I found a NEW one for $30 on the net and the bike shop matched the price.
You MUST get the proper diameter!!!!!
Rock Hoppers seat posts varied from year to year, so you can't assume they have a generic size for that model.
You MIGHT be able to find the proper diameter on bikepedia.com
I installed a 400MM post on my bike last summer for the same reason as you.
I found a NEW one for $30 on the net and the bike shop matched the price.
#9
Senior Member
Join Date: Jan 2008
Location: Beaverton, OR
Posts: 14,744
Bikes: Yes
Mentioned: 525 Post(s)
Tagged: 0 Thread(s)
Quoted: 3230 Post(s)
Liked 3,868 Times
in
1,439 Posts
Not that it matters, but I think that may actually be a 17" frame. According to a 1989 Specialized catalog I found online, that bike was available in 15, 17, 19.5, 21.5 and 22.5.
I think my Rockhopper is a 19.5.
Ironically, I'm generally happy with 17" mountain bikes. For some reason this one feels smaller. I guess because they were still experimenting with MTB geometry back then.
You can probably get a Kalloy seatpost in the size you need for around $20 if your LBS doesn't charge you shipping.
I think my Rockhopper is a 19.5.
Ironically, I'm generally happy with 17" mountain bikes. For some reason this one feels smaller. I guess because they were still experimenting with MTB geometry back then.
You can probably get a Kalloy seatpost in the size you need for around $20 if your LBS doesn't charge you shipping.
__________________
My Bikes
My Bikes
#10
Constant tinkerer
MTB geometry/fit is way different than road fit. In my experience, a MTB feels best when the seatpost (300mm) is almost to the minimum insertion point which puts me on 18" frames (BUT these are "newer" MTBs with sloping top tubes from the 1990s). I ride 22-23" road frames. If the photo of your bike is setup for you now, I would say the fit is fine.
I once tried riding a 16" MTB with a 400mm post and decided that I didn't like the fit and sold it.
I once tried riding a 16" MTB with a 400mm post and decided that I didn't like the fit and sold it.
#11
Really Old Senior Member
I thought you were going to stick that into the seat tube!
#12
Zeusmeatball
Thread Starter
Join Date: Jun 2009
Location: CT
Posts: 259
Bikes: 1976 Motobecane Nomade Sprint, 1988 Specialized Rockhopper comp, 1991 Schwinn Crisscross, 2009 K2 Zed 3.2, 2011 Trek X-Caliber Gary Fisher collection
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Not that it matters, but I think that may actually be a 17" frame. According to a 1989 Specialized catalog I found online, that bike was available in 15, 17, 19.5, 21.5 and 22.5.
I think my Rockhopper is a 19.5.
Ironically, I'm generally happy with 17" mountain bikes. For some reason this one feels smaller. I guess because they were still experimenting with MTB geometry back then.
You can probably get a Kalloy seatpost in the size you need for around $20 if your LBS doesn't charge you shipping.
I think my Rockhopper is a 19.5.
Ironically, I'm generally happy with 17" mountain bikes. For some reason this one feels smaller. I guess because they were still experimenting with MTB geometry back then.
You can probably get a Kalloy seatpost in the size you need for around $20 if your LBS doesn't charge you shipping.
MTB geometry/fit is way different than road fit. In my experience, a MTB feels best when the seatpost (300mm) is almost to the minimum insertion point which puts me on 18" frames (BUT these are "newer" MTBs with sloping top tubes from the 1990s). I ride 22-23" road frames. If the photo of your bike is setup for you now, I would say the fit is fine.
I once tried riding a 16" MTB with a 400mm post and decided that I didn't like the fit and sold it.
I once tried riding a 16" MTB with a 400mm post and decided that I didn't like the fit and sold it.
Nah, wasn't gonna stick that in the seat tube, my original post I asked about riser bars and fietsbob mentioned the stem riser (thats what the link was)
#13
Senior Member
Join Date: Jan 2008
Location: Beaverton, OR
Posts: 14,744
Bikes: Yes
Mentioned: 525 Post(s)
Tagged: 0 Thread(s)
Quoted: 3230 Post(s)
Liked 3,868 Times
in
1,439 Posts
Ah, I missed that. I thought the color scheme was sufficient to determine year.
As pictured above, it just had new tires and was otherwise as I bought it (used but in near-mint condition). I've since changed out everything but the seat post, saddle, crank arms and headset.
__________________
My Bikes
My Bikes
#14
aka Tom Reingold
Join Date: Jan 2009
Location: New York, NY, and High Falls, NY, USA
Posts: 40,503
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
Mentioned: 511 Post(s)
Tagged: 0 Thread(s)
Quoted: 7348 Post(s)
Liked 2,470 Times
in
1,435 Posts
There's about a dozen (or more?) different seat post diameters in .2MM (.008") increments!
You MUST get the proper diameter!!!!!
Rock Hoppers seat posts varied from year to year, so you can't assume they have a generic size for that model.
You MIGHT be able to find the proper diameter on bikepedia.com
I installed a 400MM post on my bike last summer for the same reason as you.
I found a NEW one for $30 on the net and the bike shop matched the price.
You MUST get the proper diameter!!!!!
Rock Hoppers seat posts varied from year to year, so you can't assume they have a generic size for that model.
You MIGHT be able to find the proper diameter on bikepedia.com
I installed a 400MM post on my bike last summer for the same reason as you.
I found a NEW one for $30 on the net and the bike shop matched the price.
__________________
Tom Reingold, tom@noglider.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog
“When man invented the bicycle he reached the peak of his attainments.” — Elizabeth West, US author
Please email me rather than PM'ing me. Thanks.
Tom Reingold, tom@noglider.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog
“When man invented the bicycle he reached the peak of his attainments.” — Elizabeth West, US author
Please email me rather than PM'ing me. Thanks.
#15
working on my sandal tan
Join Date: Aug 2011
Location: CID
Posts: 22,629
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
Mentioned: 98 Post(s)
Tagged: 0 Thread(s)
Quoted: 3871 Post(s)
Liked 2,568 Times
in
1,579 Posts
When I got back into biking in 2008 or so, I didn't realize that the $180 mountain bike I'd purchased from Target was actually a "youth size" until I held it up to the one my roommate had gotten. It worked for the most part, but when I pondered the fact that I only had about 1" of seat tube in the seat post, I realized it was time for a larger bike.
- Scott
- Scott
Thread
Thread Starter
Forum
Replies
Last Post
pavement_nyc
Bicycle Mechanics
12
05-15-11 09:42 AM