Need help with and Ironman tires and brakes
03-20-23, 03:25 AM
#26
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And what about when you have stop very quickly in a emergency, single pivot weren't enough efficient apparently because 33 years Shimano introduce them with in1990 Dura Ace BR 7403, 2 years later Campy introduced the Record dual pivot brakes. Unnecessary improvement ? Debatable especially in an emergency stop or under rain. Maybe a comparison between stopping distances between a single pivot brakes and dual pivot brakes,will show the dramatic improvement in stopping.I think when you ride a road bike fast the goal is to stop when needed and not get into accident. The brifter thing is another debate,after Shimano ceased the production of the ST 7801 brifers,I stopped myself interesting to the new Dura Ace groupsets.
assuming that they must be better because shipmano made them is crazy since 75-90% of shimano’s main concern is profit and market share.
if you brakes are in good order they’ll stop you just fine.
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03-20-23, 04:36 AM
#27
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If having dual pivot brakes was such huge leap in safety why did shipmano wait 3-4 years to incorporate them into every group? Why didn’t the CPSC mandate that all bikes be retrofitted with them?
assuming that they must be better because shipmano made them is crazy since 75-90% of shimano’s main concern is profit and market share.
if you brakes are in good order they’ll stop you just fine.
assuming that they must be better because shipmano made them is crazy since 75-90% of shimano’s main concern is profit and market share.
if you brakes are in good order they’ll stop you just fine.
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03-20-23, 06:39 AM
#28
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It's not an important distinction, though.
03-20-23, 07:24 AM
#29
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And what about when you have stop very quickly in a emergency, single pivot weren't enough efficient apparently because 33 years Shimano introduce them with in1990 Dura Ace BR 7403, 2 years later Campy introduced the Record dual pivot brakes. Unnecessary improvement ? Debatable especially in an emergency stop or under rain. Maybe a comparison between stopping distances between a single pivot brakes and dual pivot brakes,will show the dramatic improvement in stopping.I think when you ride a road bike fast the goal is to stop when needed and not get into accident. The brifter thing is another debate,after Shimano ceased the production of the ST 7801 brifers,I stopped myself interesting to the new Dura Ace groupsets.
The cable entry changed the leverage so dual pivots became a requirement not an improvement.
Levers have been understood for a long time.
Try good single pivots and good levers.
3
03-20-23, 07:43 AM
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FWIW I have an 89 Master and I don't think 28s (especially older Contis like the 4000s) fit. It's a 25mm tire road bike in my book.
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03-20-23, 08:42 AM
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I have never had single pivot brake on any of my race bikes ,my father had single pivot brakes on his race bike, I am not into single pivot brakes especially on my race bikes
Last edited by georges1; 03-20-23 at 08:47 AM.
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03-20-23, 08:50 AM
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03-20-23, 09:52 AM
#33
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I have discovered that if you back out the centering screw on top of the caliper it gives a bit more clearance. You then re-center by moving the whole caliper. This also spreads the pads out more when the release is opened.
03-20-23, 11:47 AM
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Don’t see any mention of what rim is being used here. Wider rims = larger tires.
Nominal (labeled) tire sizes are often not what you get when you mount a tire, can be narrower on a narrow rim or wider on a wide rim.
Still, I can easily fit 25mm Conti’s and Vittoria’s on my 87 Ironman when using a 13-14mm (measured inside) rim like an Open Pro.
Same tire on a wider rim might measure 26-27mm.
Nominal (labeled) tire sizes are often not what you get when you mount a tire, can be narrower on a narrow rim or wider on a wide rim.
Still, I can easily fit 25mm Conti’s and Vittoria’s on my 87 Ironman when using a 13-14mm (measured inside) rim like an Open Pro.
Same tire on a wider rim might measure 26-27mm.
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03-20-23, 12:43 PM
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Seems that some folks who grew up with mushy, inefficient brakes don't mind that feeling, and think that dual-pivots with compressionless housing might be too "grabby."
03-20-23, 01:10 PM
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I had Dura Ace 7400 single-pivot brakes and 7402 aero levers. Compared to my DA 7700 dual-pivot brakes with the same levers, the 7400s sucked. Simply no comparison.
Seems that some folks who grew up with mushy, inefficient brakes don't mind that feeling, and think that dual-pivots with compressionless housing might be too "grabby."
Seems that some folks who grew up with mushy, inefficient brakes don't mind that feeling, and think that dual-pivots with compressionless housing might be too "grabby."
03-20-23, 01:22 PM
#38
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03-20-23, 07:11 PM
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Is this the snob thread? I think I’m lost.
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03-20-23, 07:17 PM
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03-20-23, 07:21 PM
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03-20-23, 09:02 PM
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03-21-23, 06:54 AM
#43
Blamester
I had Dura Ace 7400 single-pivot brakes and 7402 aero levers. Compared to my DA 7700 dual-pivot brakes with the same levers, the 7400s sucked. Simply no comparison.
Seems that some folks who grew up with mushy, inefficient brakes don't mind that feeling, and think that dual-pivots with compressionless housing might be too "grabby."
Seems that some folks who grew up with mushy, inefficient brakes don't mind that feeling, and think that dual-pivots with compressionless housing might be too "grabby."
Engineers have understood levers ,human handsize and how brakes work for a long time, even before 1985 they knew.
03-21-23, 07:28 AM
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03-21-23, 07:33 AM
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03-21-23, 07:34 AM
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03-21-23, 07:43 AM
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They can't control the width of the rim you're using. Narrower rim = narrower tire, wider rim = wider tire. Plain as that.
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03-21-23, 08:00 AM
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03-21-23, 08:20 AM
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Without knowing which tires you're using I can't say for sure. But, as a general rule of thumb, tires made a while back we made with the common rim widths of that day, like 15-17mm ID. These days ID is wider, so tires like the 4000s, which were made for narrow rims, balloon on modern wider rims. Also, yes, tire widths vary from manufacturer to manufacturer. I feel like we're arguing but I'm not sure about what lol. This is not an exact science, and there exceptions to every rule. You might have found one.
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03-21-23, 08:32 AM
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https://www.bikeforums.net/road-cycl...fe-widths.html