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MA3-to-Open Sport rims and tight 700c tires
I just had a wheel with a cracked MA3 rim replaced with an Open Sport,
and I'm having more trouble than usual getting the tire mounted. Usually I can get them on without levers or with very minor persuasion, but the same exact "worn-in" Michelin Axial tires that fit fine on the MA3s needed significant plastic leverage to pop them on. We're not talking hernia-inducing industrial strength force here, but a good deal more than normal. What's worse is that while riding I noticed the tire has a bit of a flat spot. After checking for any inconsistencies in the rim itself, I swapped the Axial with another used tire, a Bontrager this time. This one came smoothly off a Mavic Reflex rim, but I had the same issues when installed on the new Open Sport. (I should include that I also installed a brand new, unpatched tube as well, even though the previous tube looked fine.) I checked the tire's alignment on the rim while inflating and pushed/pulled where it looked uneven, but without much luck. I think that the ERD between the MA3 and Open Sport rims is identical or within a mm. Is the diameter of the Open Sports much wider than the MA3s? If so, are there tires people find work well with them? I hate to buy a new tire because this is my "trickle down" bike, but if it gets rid of the maddening flat spot then so be it. TIA. Scott |
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#2
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MA3-to-Open Sport rims and tight 700c tires
Scott Gordo wrote:
I just had a wheel with a cracked MA3 rim replaced with an Open Sport, and I'm having more trouble than usual getting the tire mounted. Usually I can get them on without levers or with very minor persuasion, but the same exact "worn-in" Michelin Axial tires that fit fine on the MA3s needed significant plastic leverage to pop them on. We're not talking hernia-inducing industrial strength force here, but a good deal more than normal. What's worse is that while riding I noticed the tire has a bit of a flat spot. After checking for any inconsistencies in the rim itself, I swapped the Axial with another used tire, a Bontrager this time. This one came smoothly off a Mavic Reflex rim, but I had the same issues when installed on the new Open Sport. (I should include that I also installed a brand new, unpatched tube as well, even though the previous tube looked fine.) I checked the tire's alignment on the rim while inflating and pushed/pulled where it looked uneven, but without much luck. I think that the ERD between the MA3 and Open Sport rims is identical or within a mm. Is the diameter of the Open Sports much wider than the MA3s? If so, are there tires people find work well with them? I hate to buy a new tire because this is my "trickle down" bike, but if it gets rid of the maddening flat spot then so be it. TIA. Scott to me, the open sport seems to have a deeper central channel, not shallower than the ma3. on that basis, the tire beads ought to be looser, not tighter. are you making sure the beads are centered into the channel as you go? |
#3
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MA3-to-Open Sport rims and tight 700c tires
Scott Gordo Wrote: I just had a wheel with a cracked MA3 rim replaced with an Open Sport, and I'm having more trouble than usual getting the tire mounted. Usually I can get them on without levers or with very minor persuasion, but the same exact "worn-in" Michelin Axial tires that fit fine on the MA3s needed significant plastic leverage to pop them on. We're not talking hernia-inducing industrial strength force here, but a good deal more than normal. What's worse is that while riding I noticed the tire has a bit of a flat spot. After checking for any inconsistencies in the rim itself, I swapped the Axial with another used tire, a Bontrager this time. This one came smoothly off a Mavic Reflex rim, but I had the same issues when installed on the new Open Sport. (I should include that I also installed a brand new, unpatched tube as well, even though the previous tube looked fine.) I checked the tire's alignment on the rim while inflating and pushed/pulled where it looked uneven, but without much luck. I think that the ERD between the MA3 and Open Sport rims is identical or within a mm. Is the diameter of the Open Sports much wider than the MA3s? If so, are there tires people find work well with them? I hate to buy a new tire because this is my "trickle down" bike, but if it gets rid of the maddening flat spot then so be it. TIA. Scott The Effective Rim Diameter is a dimension for spokes, not tire Bead Seat Diameter. 622 mm is the "standard" for Bead Seat Diameter (BSD). All 700C rims & tires are to meeet the 622 mm BSD. However, due to manufacturing tolerances and even spoke tension, exactly meeting the 622 mm standard rarely happens. -- daveornee |
#4
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MA3-to-Open Sport rims and tight 700c tires
On Jul 31, 9:11 am, daveornee daveornee.2ul...@no-
mx.forums.cyclingforums.com wrote: Scott Gordo Wrote: I just had a wheel with a cracked MA3 rim replaced with an Open Sport, and I'm having more trouble than usual getting the tire mounted. Usually I can get them on without levers or with very minor persuasion, but the same exact "worn-in" Michelin Axial tires that fit fine on the MA3s needed significant plastic leverage to pop them on. We're not talking hernia-inducing industrial strength force here, but a good deal more than normal. What's worse is that while riding I noticed the tire has a bit of a flat spot. After checking for any inconsistencies in the rim itself, I swapped the Axial with another used tire, a Bontrager this time. This one came smoothly off a Mavic Reflex rim, but I had the same issues when installed on the new Open Sport. (I should include that I also installed a brand new, unpatched tube as well, even though the previous tube looked fine.) I checked the tire's alignment on the rim while inflating and pushed/pulled where it looked uneven, but without much luck. I think that the ERD between the MA3 and Open Sport rims is identical or within a mm. Is the diameter of the Open Sports much wider than the MA3s? If so, are there tires people find work well with them? I hate to buy a new tire because this is my "trickle down" bike, but if it gets rid of the maddening flat spot then so be it. TIA. Scott The Effective Rim Diameter is a dimension for spokes, not tire Bead Seat Diameter. 622 mm is the "standard" for Bead Seat Diameter (BSD). All 700C rims & tires are to meeet the 622 mm BSD. However, due to manufacturing tolerances and even spoke tension, exactly meeting the 622 mm standard rarely happens. -- daveornee- Hide quoted text - - Show quoted text - I just flatted on the way in, so I'll get another opportunity to be sure that the beads sit properly pre-inflation Thanks for the info on BSD. I knew ERD wasn't the same thing, I was just using it to suggest that the rim is the same dimensionally as far as spoke length goes anyway. The fact that all 700s should have a 622mm BSD makes that moot, obviously. With that said, I've definitely had tires that fit tighter or more loosely on my MTB's rims. This is, as you said, likely due to inconsistencies in the manufacturing process, but are there any recommendation for road tires that have a tendency to run slightly bigger? /s |
#5
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MA3-to-Open Sport rims and tight 700c tires
Scott Gordo Wrote:
I just had a wheel with a cracked MA3 rim replaced with an Open Sport, and I'm having more trouble than usual getting the tire mounted. Usually I can get them on without levers or with very minor persuasion, but the same exact "worn-in" Michelin Axial tires that fit fine on the MA3s needed significant plastic leverage to pop them on. We're not talking hernia-inducing industrial strength force here, but a good deal more than normal. What's worse is that while riding I noticed the tire has a bit of a flat spot. After checking for any inconsistencies in the rim itself, I swapped the Axial with another used tire, a Bontrager this time. This one came smoothly off a Mavic Reflex rim, but I had the same issues when installed on the new Open Sport. (I should include that I also installed a brand new, unpatched tube as well, even though the previous tube looked fine.) I checked the tire's alignment on the rim while inflating and pushed/pulled where it looked uneven, but without much luck. I think that the ERD between the MA3 and Open Sport rims is identical or within a mm. Is the diameter of the Open Sports much wider than the MA3s? If so, are there tires people find work well with them? I hate to buy a new tire because this is my "trickle down" bike, but if it gets rid of the maddening flat spot then so be it. daveornee wrote: The Effective Rim Diameter is a dimension for spokes, not tire Bead Seat Diameter. 622 mm is the "standard" for Bead Seat Diameter (BSD). All 700C rims & tires are to meeet the 622 mm BSD. However, due to manufacturing tolerances and even spoke tension, exactly meeting the 622 mm standard rarely happens. Scott Gordo wrote: I just flatted on the way in, so I'll get another opportunity to be sure that the beads sit properly pre-inflation Thanks for the info on BSD. I knew ERD wasn't the same thing, I was just using it to suggest that the rim is the same dimensionally as far as spoke length goes anyway. The fact that all 700s should have a 622mm BSD makes that moot, obviously. With that said, I've definitely had tires that fit tighter or more loosely on my MTB's rims. This is, as you said, likely due to inconsistencies in the manufacturing process, but are there any recommendation for road tires that have a tendency to run slightly bigger? A regular customer was just in bitching and moaning about how hard his tire was to remove. After we took out 2 thick rim liners and installed one thin Torelli rim liner the tire mounted easily (normally). Check that. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
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