Go Back  Bike Forums > Bike Forums > Mountain Biking
Reload this Page >

Advice on Narrow Rims for Narrow Tires

Mountain Biking Mountain biking is one of the fastest growing sports in the world. Check out this forum to discuss the latest tips, tricks, gear and equipment in the world of mountain biking.

Advice on Narrow Rims for Narrow Tires

Old 05-09-12, 12:13 PM
  #1  
jcahow
Junior Member
Thread Starter
 
Join Date: May 2012
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Advice on Narrow Rims for Narrow Tires

I have a old mountain bike which I run with narrow tires (26x1.0) on vintage Bontager cut down Mavic MA40 narrow 32 hole road rims. The bike currently is running a 7 speed setup but all the parts on the bike (except for the old style XT single lever thumb shifters and XT 130mm 7 speed rear freehub/cassette) are XT 8 speed compatible. It has Syncros 48/36/24 chainrings on a XT crankset and I run a 7 speed 12-21 hyperglide cassette so it really moves for a mountain bike.

I always thought the old Specialized steel Stumpjumper frame I am using was 130mm wide in the rear but actually I just noticed it is the standard 135mm. I am currently using a 130mm free hub and just pulling the frame closer together when the skewer is closed.

I have XT 8 speed dual lever shifters and a XT 135mm 8 speed rear freehub available and I want to convert over to a entire 8 speed setup on this bike using the same width narrow tires to get an extra gear and use the right width (135mm) freehub. I would use a 12/21 hyperglide 8 speed cluster on the freehub.

My problem is that I cannot seem to locate anymore vintage Mavic MA40 26" narrow rims so I am looking for the narrowest mountain bike 32 hole rim still available preferably drilled for presta valves. Yes, I can use the MA40 rim currently on the 7 speed freehub but I would prefer not destroying that wheel if I can.

I see Mavic currently sells the XC 717 and XM 317 rims which it says mount 1.0 to 2.10 tires although they are still wider than a traditional road rim. I wonder how they actually handle 1.0 tires though and they are drilled for schrader tubes (although they have a presta adapter).

Can anyone suggest any alternate narrow 32 hole 26" presta drilled rims that I could run 26x1.0 tires on without problems?
jcahow is offline  
Old 05-09-12, 12:37 PM
  #2  
Andy_K 
Senior Member
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Posts: 12,031

Bikes: Yes

Mentioned: 282 Post(s)
Tagged: 0 Thread(s)
Quoted: 1729 Post(s)
Liked 10 Times in 9 Posts
I've got a pair of XM317 rims on my old RockHopper right now. I'm using 26x1.25 tires, but I could easily go narrower. I'm not sure what Mavic says about it, but this rim is about the same width as an Open Pro. You can also get them dirt cheap from Cross Lake Sales (contrary to what their site says, the rims they're selling are machined for rim brakes).

Who makes a 26x1.0 tire?
__________________
My Bikes
Andy_K is offline  
Old 05-10-12, 01:07 PM
  #3  
jcahow
Junior Member
Thread Starter
 
Join Date: May 2012
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks for the info.

I am running Continental Gran Prix 26x1.0 tires. They are just like the 700c road version just smaller in diameter and rated to 120 PSI. They supposedly come in wired and foldable versions but I was only able to find the wired version online when I bought a pair earlier this year. I think they were 35 or 40 dollars each.

I was just reading another thread on a different site where they listed some other 26x1.0 tires as well but it was a few years old. I use to run a Specialized 26x1.0 front tire but I like the Continentals alot better and switched over to the new pair.

Open Pro road rims are 20mm wide outside (the same as the Bontrager cut down MA40 rims) which would make them around 14-15mm width inside. Older Mavic 217 mountain rims are about 22.5mm wide outside which would make them around 16-17mm width inside. Mavic lists the XC 717 and XM 317 as 17mm wide inside. So the Mavic mountain rims are a couple of mm wider inside than straight road rims and so I was worried if they would run 1.0 tire decently and not get pinch flats.

Cross Lake Sales is recommending 1.5 to 2.3 tires for the XM 317 whereas Mavic is saying 1.0 to 2.1 tires for the same rim.
jcahow is offline  
Old 05-10-12, 03:40 PM
  #4  
Andy_K 
Senior Member
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Posts: 12,031

Bikes: Yes

Mentioned: 282 Post(s)
Tagged: 0 Thread(s)
Quoted: 1729 Post(s)
Liked 10 Times in 9 Posts
You're right. I just measured my Open Pros and my XM317's, and they came out at 20.1 mm and 22.3 mm respectively, but in my mind that's about the same width. I don't have an XM317 without a tire on it, but if you're right about the 17 mm inside width, and that sounds about right, that still puts a one inch tire within the conservative compatibility guidelines you find from Sheldon Brown or Schwalbe. The recommended sizes on Cross Lake's site are what Mavic used to have on their site. It's non-sense if you ask me. I've got 2.3's on an old Mavic X221 (exact same width as the XM317) and it looks ridiculous. As long as you keep your pressure high, you'd be fine with the XM317's.
__________________
My Bikes
Andy_K is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
leob1
Fifty Plus (50+)
0
11-04-15 02:53 PM
Jax Rhapsody
BMX
0
10-05-15 12:58 AM
turtlemilk
General Cycling Discussion
12
01-11-10 04:41 AM
concernicus
Singlespeed & Fixed Gear
1
03-02-06 08:28 PM
MoshB
BMX
0
03-20-02 12:43 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

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.