Upgrade of my Shimano RS-81 wheels
08-28-20, 10:53 PM
#1
Member
Thread Starter
Upgrade of my Shimano RS-81 wheels
Hi everybody, I have 2015 Cannondale SuperSix Evo Ultegra bike with rim brakes, Shimano RS-81 wheels and Vittoria Rubino Pro 700x25mm tires. Want to upgrade wheels but I am afraid of clearance since now the distance between rear tire and chainstays is around 3mm (may be around 3.5mm but no more) on each side. My wheels have 15mm internal width and 20.8mm external width. So which wheel set would you recommend and what is max internal/external width Ok for my bike?
Last edited by vlad1xxi; 08-29-20 at 06:51 AM.
08-29-20, 05:33 AM
#2
bike whisperer
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 9,537
Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1523 Post(s)
Liked 716 Times
in
508 Posts
Given your clearance is already minimal, I'd stick with the Shimanos.
Their narrow width is about the only thing that counts against them, and they're excellent in almost every other way except I guess the aesthetics of the hubs, the internals of which are peerless, IMO. The rims are pretty sweet too.
Although I suppose you'd just have room to run a 25 on a somewhat wider rim, by the sound of it... Not a whole lot of wiggle room though.
Here's a question - what do you weigh? If you're 70-75kg or less, you can probably go for broke minimising the clearance, particularly since a larger tyre on a wider rim is going to be less likely to go out of true, all else being equal.
Their narrow width is about the only thing that counts against them, and they're excellent in almost every other way except I guess the aesthetics of the hubs, the internals of which are peerless, IMO. The rims are pretty sweet too.
Although I suppose you'd just have room to run a 25 on a somewhat wider rim, by the sound of it... Not a whole lot of wiggle room though.
Here's a question - what do you weigh? If you're 70-75kg or less, you can probably go for broke minimising the clearance, particularly since a larger tyre on a wider rim is going to be less likely to go out of true, all else being equal.
__________________
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Last edited by Kimmo; 08-29-20 at 05:38 AM.
Likes For Kimmo:
08-29-20, 05:48 AM
#3
Member
Thread Starter
Given your clearance is already minimal, I'd stick with the Shimanos.
Their narrow width is about the only thing that counts against them, and they're excellent in almost every other way except I guess the aesthetics of the hubs, the internals of which are peerless, IMO. The rims are pretty sweet too.
Although I suppose you'd just have room to run a 25 on a somewhat wider rim, by the sound of it... Not a whole lot of wiggle room though.
Here's a question - what do you weigh? If you're 70-75kg or less, you can probably go for broke minimising the clearance, particularly since a larger tyre on a wider rim is going to be less likely to go out of true, all else being equal.
Their narrow width is about the only thing that counts against them, and they're excellent in almost every other way except I guess the aesthetics of the hubs, the internals of which are peerless, IMO. The rims are pretty sweet too.
Although I suppose you'd just have room to run a 25 on a somewhat wider rim, by the sound of it... Not a whole lot of wiggle room though.
Here's a question - what do you weigh? If you're 70-75kg or less, you can probably go for broke minimising the clearance, particularly since a larger tyre on a wider rim is going to be less likely to go out of true, all else being equal.
08-29-20, 07:16 PM
#4
bike whisperer
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 9,537
Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1523 Post(s)
Liked 716 Times
in
508 Posts
How deep are the RS81s? I'm guessing they're the C25 version. You can get em deeper, you know. Up to 60mm, IIRC.
Again, if you're stuck with old-school width, these Shimano wheels with the carbon/ally rims are about as good as rim-braked clinchers get, IMO.
Something to consider is that aero rears aren't doing much aero in all that dirty air; something like 4/5 or more of the gain is from the front wheel. So you could just throw a Zipp or whatever on the front.
Again, if you're stuck with old-school width, these Shimano wheels with the carbon/ally rims are about as good as rim-braked clinchers get, IMO.
Something to consider is that aero rears aren't doing much aero in all that dirty air; something like 4/5 or more of the gain is from the front wheel. So you could just throw a Zipp or whatever on the front.
__________________
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Last edited by Kimmo; 08-29-20 at 07:25 PM.
Likes For Kimmo:
08-30-20, 03:56 AM
#6
bike whisperer
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 9,537
Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1523 Post(s)
Liked 716 Times
in
508 Posts
Kimmo Good to see you back here. I was beginning to think the Covid got you.
How about round your way? Things look pretty damn sketchy over there.
__________________
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
08-30-20, 09:00 AM
#7
Senior Member
Join Date: Nov 2015
Posts: 8,922
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 4717 Post(s)
Liked 1,882 Times
in
998 Posts
08-30-20, 08:06 PM
#8
Member
Thread Starter
How deep are the RS81s? I'm guessing they're the C25 version. You can get em deeper, you know. Up to 60mm, IIRC.
Again, if you're stuck with old-school width, these Shimano wheels with the carbon/ally rims are about as good as rim-braked clinchers get, IMO.
Something to consider is that aero rears aren't doing much aero in all that dirty air; something like 4/5 or more of the gain is from the front wheel. So you could just throw a Zipp or whatever on the front.
Again, if you're stuck with old-school width, these Shimano wheels with the carbon/ally rims are about as good as rim-braked clinchers get, IMO.
Something to consider is that aero rears aren't doing much aero in all that dirty air; something like 4/5 or more of the gain is from the front wheel. So you could just throw a Zipp or whatever on the front.
08-31-20, 04:27 AM
#9
Senior Member
Join Date: Jan 2007
Location: Eastern VA
Posts: 1,716
Bikes: 2022 Fuel EX 8, 2021 Domane SL6, Black Beta (Nashbar frame), 2004 Trek 1000C for the trainer
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 265 Post(s)
Liked 447 Times
in
266 Posts
You are right. I forgot to mention my Shimano wheels are C24. I am aware about C40 and C60 wheels and think about Shimano Dura Ace C40 wheelset as a very good and expensive replacement of my current wheels. But what do you think about Campy Eurus or DT Swiss wheels? I saw some DT Swiss with external width 22mm which should work for my bike as well.
I just put a new 23mm Conti 5000 tire on and it measure 25.0 mm wide after sitting for a couple of hours. Conti may have made adjustments.
Last edited by biker128pedal; 09-03-20 at 07:43 PM. Reason: New tire
Likes For biker128pedal:
