Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

New hybrid or new mountain bike?

Notices
General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

New hybrid or new mountain bike?

Old 04-08-12, 11:16 AM
  #1  
FieldEffect
Senior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 57
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
New hybrid or new mountain bike?

The 8.4 DS seems like it'll be a good town bike for riding the busted sidewalks and going off in the grass and dirt on occasion. I thought it would be nice if it would serve as a secondary mountain bike in case I wanted to go ride with a friend that didn't have a bike. But that may be expecting too much.

Another option I considered is putting some thinner tires on my Cobia and then just buying a new mountain bike, such as an X-Cal or Superfly AL. That would be more expensive though. And I'm not sure a Cobia with thinner tires would be quite as fast on pavement as the 8.4 DS.

Opinions?
FieldEffect is offline  
Old 04-08-12, 02:22 PM
  #2  
no1mad 
Thunder Whisperer
 
no1mad's Avatar
 
Join Date: Apr 2008
Location: NE OK
Posts: 8,852

Bikes: '06 Kona Smoke

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 274 Post(s)
Likes: 0
Liked 5 Times in 1 Post
By 'thinner tires', do you mean narrower? Or less aggressive tread pattern? I've got 26x1.5" tires that are on the slickish side and can hit speeds of 20+ mph on the flats under ideal conditions.
__________________
Community guidelines
no1mad is offline  
Old 04-08-12, 02:40 PM
  #3  
FieldEffect
Senior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 57
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by no1mad View Post
By 'thinner tires', do you mean narrower? Or less aggressive tread pattern? I've got 26x1.5" tires that are on the slickish side and can hit speeds of 20+ mph on the flats under ideal conditions.
Well, my Cobia currently has 29x2.25 tires. The 8.4 DS uses 700x38c tires. I'm fairly sure I could put 700x38c tires on the Cobia without any trouble. If I did, I'm wondering how it would ride compared to the 8.4DS.
FieldEffect is offline  
Old 04-08-12, 03:11 PM
  #4  
no1mad 
Thunder Whisperer
 
no1mad's Avatar
 
Join Date: Apr 2008
Location: NE OK
Posts: 8,852

Bikes: '06 Kona Smoke

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 274 Post(s)
Likes: 0
Liked 5 Times in 1 Post
On paper (screen, actually), the 8.4 DS should be faster on asphalt because of the gearing.
__________________
Community guidelines
no1mad is offline  
Old 04-10-12, 08:35 AM
  #5  
FieldEffect
Senior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 57
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Ah, makes sense. I wish I had a weight comparison between the two bikes. Too bad Trek doesn't post that information.
FieldEffect is offline  
Old 04-10-12, 09:28 AM
  #6  
tagaproject6
Senior Member
 
tagaproject6's Avatar
 
Join Date: Aug 2009
Posts: 8,550

Bikes: Wilier Izoard XP (Record);Cinelli Xperience (Force);Specialized Allez (Rival);Bianchi Via Nirone 7 (Centaur); Colnago AC-R Disc;Colnago V1r Limited Edition;De Rosa King 3 Limited(Force 22);DeRosa Merak(Red):Pinarello Dogma 65.1 Hydro(Di2)

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 548 Post(s)
Liked 263 Times in 140 Posts
Have you looked at cross bikes?
tagaproject6 is offline  
Old 04-10-12, 09:52 AM
  #7  
DCB0
Banned.
 
Join Date: Apr 2011
Posts: 937

Bikes: CCM Torino 76

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I have looked at the geometry for both bikes and I suspect, if they had the same wheels, they will behave almost identically.

As mentioned above, the only limitation to your speed on the Cobia is that the top gear is a 44/11, while the top gear on the 8.4 would be 48/11. According to the Sheldon Brown gear calculator, with a 44/11 and 700 X 38C wheels, you will be going ~52km/hour when pedaling at 100 RPM (About 31 mph), and 57 km/hour with the 48/11 at 100 rpm (about 34 mph).

I really doubt there would be much noticable difference beyond that. Unless you plan to do a lot of road riding and need to be ready to ride rough trails necessitating wider tires in a hurry, you should just put road tires on the 8.4. THere is no need for a new bike.

Last edited by DCB0; 04-10-12 at 09:56 AM.
DCB0 is offline  
Old 04-10-12, 11:26 AM
  #8  
fietsbob
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,599

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,302 Times in 817 Posts
the air resistance is the speed limitation, not the gear ratio..
fietsbob is offline  
Old 04-10-12, 01:33 PM
  #9  
rumrunn6
Senior Member
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 24,862

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 103 Post(s)
Tagged: 0 Thread(s)
Quoted: 3723 Post(s)
Liked 851 Times in 592 Posts
maybe the OP would like a straight bar road bike? there's a bike selectionof 700 tires out there and the right bike can take wide tires.
rumrunn6 is offline  
Old 04-10-12, 01:44 PM
  #10  
FieldEffect
Senior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 57
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by rumrunn6 View Post
maybe the OP would like a straight bar road bike? there's a bike selectionof 700 tires out there and the right bike can take wide tires.
Already got one of those. I have a Trek 7.5 FX. I'm wanting to get the DS to replace it. I can't deal with no suspension.
FieldEffect is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
windhchaser
Commuting
18
11-29-12 04:23 PM
MLKATO
Clydesdales/Athenas (200+ lb / 91+ kg)
13
06-15-11 09:01 PM
colliwa
General Cycling Discussion
6
05-20-11 10:30 AM
samburger
Mountain Biking
5
04-28-10 09:59 PM
Leukybear
Singlespeed & Fixed Gear
48
01-03-10 09:23 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.