Mechanics Quick Question Thread [Ask Questions Here]

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Mechanics Quick Question Thread [Ask Questions Here]
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flag Nobble
Posted: Apr 29, 2024 at 17:14 Quote
namdoogttam wrote:
I just bought a used 2018 Cannondale Scapel-Si and the chainring looks worn. I'm shopping for replacements and see that it has a proprietary "Ai" offset (some mumbo jumbo about an asym rear triangle pushing most of the drivetrain 6mm outboard). For the life of me, I can't seem to figure out what to shop for when looking for a direct mount X-Sync 2 chainring replacement. It seems to me that the 3mm and 6mm offset chainrings are for 'regular' boost or non-boost drivetrains. At the same time, I don't see any listed for as specifically saying they fit this unique Cannondale Ai situation. Can someone set me straight?
Wolftooth list an Ai CAMO spider for the cannondale direct mount crankset. Allegedly it's a -4mm offset. https://www.wolftoothcomponents.com/collections/camo/products/camo-direct-mount-spider-for-cannondale

If you have a sram crank, it might just be a standard 3mm. I think they usually have it stamped on the back.
flag Alloypenguin
Posted: Apr 30, 2024 at 2:01 Quote
Is this a safe compromise? Never used this many spacers previously....

https://imgur.com/a/SI35rrY

TIA!
flag BaGearA
Posted: Apr 30, 2024 at 2:34 Quote
Alloypenguin wrote:
Is this a safe compromise? Never used this many spacers previously....

https://imgur.com/a/SI35rrY

TIA!

Not ideal but definitely safe

You might have a higher chance if brake shudder
flag Alloypenguin
Posted: Apr 30, 2024 at 3:34 Quote
BaGearA wrote:
Alloypenguin wrote:
Is this a safe compromise? Never used this many spacers previously....

https://imgur.com/a/SI35rrY

TIA!

Not ideal but definitely safe

You might have a higher chance if brake shudder

Cool, thanks for the input. Its temporary until the new brakes come.
flag barp
Posted: Apr 30, 2024 at 8:27 Quote
Alloypenguin wrote:
Is this a safe compromise? Never used this many spacers previously....

https://imgur.com/a/SI35rrY

TIA!

I really don't like that you used one half (the convex half) of a conical washer pair from a V-brake. Either use both halves of the pair so they can bear the clamping load properly, or only use ordinary flat washers.
flag ShawMac
O+
Posted: Apr 30, 2024 at 8:57 Quote
barp wrote:
Alloypenguin wrote:
Is this a safe compromise? Never used this many spacers previously....

https://imgur.com/a/SI35rrY

TIA!

I really don't like that you used one half (the convex half) of a conical washer pair from a V-brake. Either use both halves of the pair so they can bear the clamping load properly, or only use ordinary flat washers.

Agreed. Grab a couple of flat washers. Your brake caliper is likely to come loose like that.
flag Thirealboss
Posted: Apr 30, 2024 at 9:46 Quote
hi all .......i have a set off sid ultimate 35 mm forks......is there anyway i can up the travel to 130 and what airshaft would be compatible.....thanks
flag Nobble
Posted: Apr 30, 2024 at 10:19 Quote
Thirealboss wrote:
hi all .......i have a set off sid ultimate 35 mm forks......is there anyway i can up the travel to 130 and what airshaft would be compatible.....thanks
No, the biggest air shaft available is 120mm.

https://www.sram.com/globalassets/document-hierarchy/spare-parts/spare-parts-catalog/2024-rockshox-spare-part-catalog.pdf
flag Thirealboss
Posted: Apr 30, 2024 at 13:09 Quote
Ok another quick question

I have a trek pro calibre , the bb is pf92 I have a standard pf dub bb in it but I have sram t type wide dub cranks …….can I still use them and what spacers will I need for the correct chainline …….thanks
flag whattheheel
Posted: Apr 30, 2024 at 15:24 Quote
What is the rear axle width? 148? If so it should just be a 6mm spacer on the left. Someone correct me if I am wrong. Been out of bike shop life for a minute.
flag gabriel-mission9
Posted: Apr 30, 2024 at 16:10 Quote
Alloypenguin wrote:
Is this a safe compromise? Never used this many spacers previously....

https://imgur.com/a/SI35rrY

TIA!

There are so many things wrong with that setup. I might feasibly ride that bike to the shop. Once. But I certainly wouldnt ride it down an extended steep hill.

A) Disc rotor isnt going to be fully in the pads. If the pads wear enough they will meet and you will fairly suddenly lose all braking power

B) It's going to howl like a banshee, probably vibrate itself loose, and get really hot on long descents

C) your caliper mount bolts are bent now.
flag Thirealboss
Posted: Apr 30, 2024 at 23:40 Quote
whattheheel wrote:
What is the rear axle width? 148? If so it should just be a 6mm spacer on the left. Someone correct me if I am wrong. Been out of bike shop life for a minute.
.
Yes the rear axle is 148 , but I have been told to put a 3mm spacer on the non drive side and a 5 or 7.5 mm spacer on the drive side
flag Alloypenguin
Posted: Apr 30, 2024 at 23:55 Quote
Thirealboss wrote:
whattheheel wrote:
What is the rear axle width? 148? If so it should just be a 6mm spacer on the left. Someone correct me if I am wrong. Been out of bike shop life for a minute.
.
Yes the rear axle is 148 , but I have been told to put a 3mm spacer on the non drive side and a 5 or 7.5 mm spacer on the drive side
flag Alloypenguin
Posted: Apr 30, 2024 at 23:57 Quote
gabriel-mission9 wrote:
Alloypenguin wrote:
Is this a safe compromise? Never used this many spacers previously....

https://imgur.com/a/SI35rrY

TIA!

There are so many things wrong with that setup. I might feasibly ride that bike to the shop. Once. But I certainly wouldnt ride it down an extended steep hill.

A) Disc rotor isnt going to be fully in the pads. If the pads wear enough they will meet and you will fairly suddenly lose all braking power

B) It's going to howl like a banshee, probably vibrate itself loose, and get really hot on long descents

C) your caliper mount bolts are bent now.

Yeah, its really only temp until the new brakes and mounts come. Bolts are still true.

 


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