Does anyone know PM-PM-F/R203 adapters
Attention, a purely technical post :-)
Does anyone know whether these adapters are for going from 160mm native post mount to 203mm rotors? https://erpimgs.idealhere.com/ImageF...963c864243.jpg The bellied version (which I'd need) seems to only be available from Chinese sellers and they either don't understand English or plain don't know what they are selling. Or both. For example, when I asked the either-or question whether the adapter is for 160mm to 203mm or for 180mm to 203mm the answer was "No". Refining the question in great detail resulted in "It's for 203mm". Needless to say, asking for dimensions so I can calculate it myself is generally fruitless as well. -- Regards, Joerg http://www.analogconsultants.com/ |
Does anyone know PM-PM-F/R203 adapters
On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7, Joerg wrote:
Attention, a purely technical post :-) Does anyone know whether these adapters are for going from 160mm native post mount to 203mm rotors? https://erpimgs.idealhere.com/ImageF...963c864243.jpg The bellied version (which I'd need) seems to only be available from Chinese sellers and they either don't understand English or plain don't know what they are selling. Or both. For example, when I asked the either-or question whether the adapter is for 160mm to 203mm or for 180mm to 203mm the answer was "No". Refining the question in great detail resulted in "It's for 203mm". Needless to say, asking for dimensions so I can calculate it myself is generally fruitless as well. The Avid disks are 206's I believe. I placed these adapters on the standard mounts of my Redline and they work perfectly. |
Does anyone know PM-PM-F/R203 adapters
On Thursday, October 19, 2017 at 12:27:58 PM UTC-7, Joerg wrote:
On 2017-10-19 11:47, wrote: On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7, Joerg wrote: Attention, a purely technical post :-) Does anyone know whether these adapters are for going from 160mm native post mount to 203mm rotors? https://erpimgs.idealhere.com/ImageF...963c864243.jpg The bellied version (which I'd need) seems to only be available from Chinese sellers and they either don't understand English or plain don't know what they are selling. Or both. For example, when I asked the either-or question whether the adapter is for 160mm to 203mm or for 180mm to 203mm the answer was "No". Refining the question in great detail resulted in "It's for 203mm". Needless to say, asking for dimensions so I can calculate it myself is generally fruitless as well. The Avid disks are 206's I believe. I placed these adapters on the standard mounts of my Redline and they work perfectly. You mean you used those PM-PM-F/R203 adapters in the image link above? Does the Redline have 160mm native posts? That would be perfect, then they would also work on my MTB. I'd like to use them for both wheels since both are native 160mm PM for the caliper mounts. With brake rotors bigger is better. Slight errors can be fixed by adding washers. If slightly negative my MTB buddy could grind off a smidgen since he is a tool & die maker and has machines. I didn't pay attention to what the original disk size was supposed to be. The Avids wouldn't fit and I bought the adapters which LOOK just like the one's in your picture and the disks are 206 mm as an approximate estimate with something like 3 3/4 radius using a hand held tape measure. I bought the hydraulic actuation because the reports on the manual disks was universally bad. |
Does anyone know PM-PM-F/R203 adapters
On 2017-10-20 09:13, wrote:
On Thursday, October 19, 2017 at 12:27:58 PM UTC-7, Joerg wrote: On 2017-10-19 11:47, wrote: On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7, Joerg wrote: Attention, a purely technical post :-) Does anyone know whether these adapters are for going from 160mm native post mount to 203mm rotors? https://erpimgs.idealhere.com/ImageF...963c864243.jpg The bellied version (which I'd need) seems to only be available from Chinese sellers and they either don't understand English or plain don't know what they are selling. Or both. For example, when I asked the either-or question whether the adapter is for 160mm to 203mm or for 180mm to 203mm the answer was "No". Refining the question in great detail resulted in "It's for 203mm". Needless to say, asking for dimensions so I can calculate it myself is generally fruitless as well. The Avid disks are 206's I believe. I placed these adapters on the standard mounts of my Redline and they work perfectly. You mean you used those PM-PM-F/R203 adapters in the image link above? Does the Redline have 160mm native posts? That would be perfect, then they would also work on my MTB. I'd like to use them for both wheels since both are native 160mm PM for the caliper mounts. With brake rotors bigger is better. Slight errors can be fixed by adding washers. If slightly negative my MTB buddy could grind off a smidgen since he is a tool & die maker and has machines. I didn't pay attention to what the original disk size was supposed to be. Looks like now they only have bikes for kids :-) http://redlinebicycles.com/ You and I are too old for BMX so I assume you have a CX or road bike from them and those are usually 160mm native. The Avids wouldn't fit and I bought the adapters which LOOK just like the one's in your picture and the disks are 206 mm as an approximate estimate with something like 3 3/4 radius using a hand held tape measure. Well, then I'll order two of those. I bought the hydraulic actuation because the reports on the manual disks was universally bad. Hydraulic is clearly better. Some mechanical disc brakes are ok if the rotors are larger, 7- or 8-inch. -- Regards, Joerg http://www.analogconsultants.com/ |
Does anyone know PM-PM-F/R203 adapters
On 10/20/2017 1:09 PM, Joerg wrote:
On 2017-10-20 09:13, wrote: On Thursday, October 19, 2017 at 12:27:58 PM UTC-7, Joerg wrote: On 2017-10-19 11:47, wrote: On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7, Joerg wrote: Attention, a purely technical post :-) Does anyone know whether these adapters are for going from 160mm native post mount to 203mm rotors? https://erpimgs.idealhere.com/ImageF...963c864243.jpg The bellied version (which I'd need) seems to only be available from Chinese sellers and they either don't understand English or plain don't know what they are selling. Or both. For example, when I asked the either-or question whether the adapter is for 160mm to 203mm or for 180mm to 203mm the answer was "No". Refining the question in great detail resulted in "It's for 203mm". Needless to say, asking for dimensions so I can calculate it myself is generally fruitless as well. The Avid disks are 206's I believe. I placed these adapters on the standard mounts of my Redline and they work perfectly. You mean you used those PM-PM-F/R203 adapters in the image link above? Does the Redline have 160mm native posts? That would be perfect, then they would also work on my MTB. I'd like to use them for both wheels since both are native 160mm PM for the caliper mounts. With brake rotors bigger is better. Slight errors can be fixed by adding washers. If slightly negative my MTB buddy could grind off a smidgen since he is a tool & die maker and has machines. I didn't pay attention to what the original disk size was supposed to be. Looks like now they only have bikes for kids :-) http://redlinebicycles.com/ You and I are too old for BMX so I assume you have a CX or road bike from them and those are usually 160mm native. The Avids wouldn't fit and I bought the adapters which LOOK just like the one's in your picture and the disks are 206 mm as an approximate estimate with something like 3 3/4 radius using a hand held tape measure. Well, then I'll order two of those. I bought the hydraulic actuation because the reports on the manual disks was universally bad. Hydraulic is clearly better. Some mechanical disc brakes are ok if the rotors are larger, 7- or 8-inch. "bikes for kids" ?? https://www.youtube.com/watch?v=UzS2G-TBhX4&t=188s Desmond Rhodes? Mike Escamilla? -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
Does anyone know PM-PM-F/R203 adapters
On 2017-10-20 12:33, AMuzi wrote:
On 10/20/2017 1:09 PM, Joerg wrote: On 2017-10-20 09:13, wrote: On Thursday, October 19, 2017 at 12:27:58 PM UTC-7, Joerg wrote: On 2017-10-19 11:47, wrote: On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7, Joerg wrote: Attention, a purely technical post :-) Does anyone know whether these adapters are for going from 160mm native post mount to 203mm rotors? https://erpimgs.idealhere.com/ImageF...963c864243.jpg The bellied version (which I'd need) seems to only be available from Chinese sellers and they either don't understand English or plain don't know what they are selling. Or both. For example, when I asked the either-or question whether the adapter is for 160mm to 203mm or for 180mm to 203mm the answer was "No". Refining the question in great detail resulted in "It's for 203mm". Needless to say, asking for dimensions so I can calculate it myself is generally fruitless as well. The Avid disks are 206's I believe. I placed these adapters on the standard mounts of my Redline and they work perfectly. You mean you used those PM-PM-F/R203 adapters in the image link above? Does the Redline have 160mm native posts? That would be perfect, then they would also work on my MTB. I'd like to use them for both wheels since both are native 160mm PM for the caliper mounts. With brake rotors bigger is better. Slight errors can be fixed by adding washers. If slightly negative my MTB buddy could grind off a smidgen since he is a tool & die maker and has machines. I didn't pay attention to what the original disk size was supposed to be. Looks like now they only have bikes for kids :-) http://redlinebicycles.com/ You and I are too old for BMX so I assume you have a CX or road bike from them and those are usually 160mm native. The Avids wouldn't fit and I bought the adapters which LOOK just like the one's in your picture and the disks are 206 mm as an approximate estimate with something like 3 3/4 radius using a hand held tape measure. Well, then I'll order two of those. I bought the hydraulic actuation because the reports on the manual disks was universally bad. Hydraulic is clearly better. Some mechanical disc brakes are ok if the rotors are larger, 7- or 8-inch. "bikes for kids" ?? https://www.youtube.com/watch?v=UzS2G-TBhX4&t=188s Desmond Rhodes? Mike Escamilla? Once over 50 then every rider under 40 is like a kid :-) -- Regards, Joerg http://www.analogconsultants.com/ |
Does anyone know PM-PM-F/R203 adapters
On 2017-10-18 16:41, Joerg wrote:
Attention, a purely technical post :-) Does anyone know whether these adapters are for going from 160mm native post mount to 203mm rotors? https://erpimgs.idealhere.com/ImageF...963c864243.jpg The bellied version (which I'd need) seems to only be available from Chinese sellers and they either don't understand English or plain don't know what they are selling. Or both. For example, when I asked the either-or question whether the adapter is for 160mm to 203mm or for 180mm to 203mm the answer was "No". Refining the question in great detail resulted in "It's for 203mm". Needless to say, asking for dimensions so I can calculate it myself is generally fruitless as well. So, I just dunnit. The front and back wheels of the MTB now both have 8" or 203mm rotors. Shimano SM-RT66 (SLX Deore) for now, long term I'll be looking for solid rotors. Other than the usual swap dance of washers for shimming until it was just right it was a painless switch. Braking feels nice and sturdy. Shimano recommends 18 to 35 in-lbs of torque for the rotor bolts. Seems wimpy and the previous ones sat way tighter, so I gave it a bit more oomph. While at it I adjusted out the rattle and play that always develops in the steerer after a few hundred trail miles. Every time I torque down those tiny stem bolts at the spec'd 44 in-lbs it feels like they'll strip the threads out any second. -- Regards, Joerg http://www.analogconsultants.com/ |
Does anyone know PM-PM-F/R203 adapters
On Friday, November 10, 2017 at 4:47:56 PM UTC-8, Joerg wrote:
On 2017-10-18 16:41, Joerg wrote: Attention, a purely technical post :-) Does anyone know whether these adapters are for going from 160mm native post mount to 203mm rotors? https://erpimgs.idealhere.com/ImageF...963c864243.jpg The bellied version (which I'd need) seems to only be available from Chinese sellers and they either don't understand English or plain don't know what they are selling. Or both. For example, when I asked the either-or question whether the adapter is for 160mm to 203mm or for 180mm to 203mm the answer was "No". Refining the question in great detail resulted in "It's for 203mm". Needless to say, asking for dimensions so I can calculate it myself is generally fruitless as well. So, I just dunnit. The front and back wheels of the MTB now both have 8" or 203mm rotors. Shimano SM-RT66 (SLX Deore) for now, long term I'll be looking for solid rotors. Other than the usual swap dance of washers for shimming until it was just right it was a painless switch. Braking feels nice and sturdy. Shimano recommends 18 to 35 in-lbs of torque for the rotor bolts. Seems wimpy and the previous ones sat way tighter, so I gave it a bit more oomph. While at it I adjusted out the rattle and play that always develops in the steerer after a few hundred trail miles. Every time I torque down those tiny stem bolts at the spec'd 44 in-lbs it feels like they'll strip the threads out any second. Shimano has tightening plates on their six-bolt rotors. Avid uses a higher torque spec. 5nm should be plenty to keep your stem and headset tight, but probably not in Cameron Park. - Jay Beattie. |
Does anyone know PM-PM-F/R203 adapters
On 2017-11-11 07:51, jbeattie wrote:
On Friday, November 10, 2017 at 4:47:56 PM UTC-8, Joerg wrote: On 2017-10-18 16:41, Joerg wrote: Attention, a purely technical post :-) Does anyone know whether these adapters are for going from 160mm native post mount to 203mm rotors? https://erpimgs.idealhere.com/ImageF...963c864243.jpg The bellied version (which I'd need) seems to only be available from Chinese sellers and they either don't understand English or plain don't know what they are selling. Or both. For example, when I asked the either-or question whether the adapter is for 160mm to 203mm or for 180mm to 203mm the answer was "No". Refining the question in great detail resulted in "It's for 203mm". Needless to say, asking for dimensions so I can calculate it myself is generally fruitless as well. So, I just dunnit. The front and back wheels of the MTB now both have 8" or 203mm rotors. Shimano SM-RT66 (SLX Deore) for now, long term I'll be looking for solid rotors. Other than the usual swap dance of washers for shimming until it was just right it was a painless switch. Braking feels nice and sturdy. Shimano recommends 18 to 35 in-lbs of torque for the rotor bolts. Seems wimpy and the previous ones sat way tighter, so I gave it a bit more oomph. While at it I adjusted out the rattle and play that always develops in the steerer after a few hundred trail miles. Every time I torque down those tiny stem bolts at the spec'd 44 in-lbs it feels like they'll strip the threads out any second. Shimano has tightening plates on their six-bolt rotors. All those little things are is a tiny locking lip sticking up for each screw, pair-wise. That won't hold much. One of the issues with low torque is the rotor slacking back and forth if you have to hold the bike from rolling back down a hill, then downhill again, then up, and so on. Which happens a lot on an MTB. For some reason the manufacturers can't get the tolerancing in the screws and holes tight enough. ... Avid uses a higher torque spec. 5nm should be plenty to keep your stem and headset tight, but probably not in Cameron Park. It does but only if I smear some grit-laden toothpaste on the fork tube before sliding on the stem. Not the paste for electric brushing but the regular paste. What I am saying is that 5nm feels like it's about to strip the aluminum threads out. -- Regards, Joerg http://www.analogconsultants.com/ |
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