Update: This is an article from October 20th
but I've moved it up in the posting order
so the customer with this crank can find the article more easily.
The drill is screaming!
A customer brought in what appears at first glance to be a left crank
of a SRAM RED, but it's actually the right crank.
One of the 8 bolts that secure the spider
has broken.
↑This one
Whirrrr!
This time it's a through-hole rather than a blind hole,
and after drilling, I use the Seized Bolt Remover tool
to turn the bolt-like object
and recovered it.
The Seized Bolt Remover comes in multiple types
depending on the bolt hole size.
Chip debris from the carbide drill.
It cuts smoothly.
The recovered bolt.
The fracture surface was angled, making it difficult to center the hole,
The bolt was somewhat seized, so I couldn't turn it
with a blind hole approach and had to use a through-hole instead,
but I managed to avoid damaging the crank's threads much
(the bolt tip is at the thread root diameter, so
it's quite thin there).
There were "TWO" cranks!
This one has QUARQ markings on it.
It's from the same customer, but they're different lengths.
↑This one
The threads on this one were seized,
so I had to use a helicoil to fix it.
I installed the matching spider arm,
and confirmed the helicoil goes in straight
and doesn't come loose even when
tightened quite firmly.
As for this spider, historically speaking,
I didn't buy it because I wanted to.
This 8-bolt set has a list price of ¥2,709 excluding tax.
With tax it's ¥2,979.90, so the pricing
was probably reverse-engineered to land at ¥2,980 with tax included.
At our shop, we sell these bolts individually,
and in situations like this, if the customer wants it,
we sell 2 bolts to avoid them having to buy an unnecessary set
while also keeping stock available when possible.
However, the 8-bolt set has been out of stock for a long time,
so I reluctantly bought the BCD 94mm 4-arm spider
(with 8 bolts) that happened to be in stock at the time,
purely for the bolts.
Though now it's actually useful as a jig
for verifying helicoil work.
I use BCD (Bolt Circle Diameter) notation
rather than PCD (Pitch Circle Diameter)
because that's SRAM's official designation.
SRAM spiders come in four types:
3-bolt, 5-arm, BCD 130mm, list price ¥6,350 with tax
3-bolt, 5-arm, BCD 110mm, list price ¥6,350 with tax
8-bolt, 4-arm, BCD 107mm, list price ¥7,220 with tax
8-bolt, 4-arm, BCD 94mm, list price ¥7,220 with tax
but all of these are currently out of stock at the distributors.
The 8-bolt-only set is also out of stock.
By the way, when we sourced the BCD 94 spider,
the list price at that time was ¥6,490 with tax.
The repair is complete and I want to ship the crank,
but I'm not sure if the customer wants to purchase individual bolts,
so I'm holding the shipment.
I called today too, but if you're reading this,
please get in touch.
↑Done
but I've moved it up in the posting order
so the customer with this crank can find the article more easily.
The drill is screaming!
A customer brought in what appears at first glance to be a left crank
of a SRAM RED, but it's actually the right crank.
One of the 8 bolts that secure the spider
has broken.
↑This one
Whirrrr!
This time it's a through-hole rather than a blind hole,
and after drilling, I use the Seized Bolt Remover tool
to turn the bolt-like object
and recovered it.
The Seized Bolt Remover comes in multiple types
depending on the bolt hole size.
Chip debris from the carbide drill.
It cuts smoothly.
The recovered bolt.
The fracture surface was angled, making it difficult to center the hole,
The bolt was somewhat seized, so I couldn't turn it
with a blind hole approach and had to use a through-hole instead,
but I managed to avoid damaging the crank's threads much
(the bolt tip is at the thread root diameter, so
it's quite thin there).
There were "TWO" cranks!
This one has QUARQ markings on it.
It's from the same customer, but they're different lengths.
↑This one
The threads on this one were seized,
so I had to use a helicoil to fix it.
I installed the matching spider arm,
and confirmed the helicoil goes in straight
and doesn't come loose even when
tightened quite firmly.
As for this spider, historically speaking,
I didn't buy it because I wanted to.
This 8-bolt set has a list price of ¥2,709 excluding tax.
With tax it's ¥2,979.90, so the pricing
was probably reverse-engineered to land at ¥2,980 with tax included.
At our shop, we sell these bolts individually,
and in situations like this, if the customer wants it,
we sell 2 bolts to avoid them having to buy an unnecessary set
while also keeping stock available when possible.
However, the 8-bolt set has been out of stock for a long time,
so I reluctantly bought the BCD 94mm 4-arm spider
(with 8 bolts) that happened to be in stock at the time,
purely for the bolts.
Though now it's actually useful as a jig
for verifying helicoil work.
I use BCD (Bolt Circle Diameter) notation
rather than PCD (Pitch Circle Diameter)
because that's SRAM's official designation.
SRAM spiders come in four types:
3-bolt, 5-arm, BCD 130mm, list price ¥6,350 with tax
3-bolt, 5-arm, BCD 110mm, list price ¥6,350 with tax
8-bolt, 4-arm, BCD 107mm, list price ¥7,220 with tax
8-bolt, 4-arm, BCD 94mm, list price ¥7,220 with tax
but all of these are currently out of stock at the distributors.
The 8-bolt-only set is also out of stock.
By the way, when we sourced the BCD 94 spider,
the list price at that time was ¥6,490 with tax.
but I'm not sure if the customer wants to purchase individual bolts,
so I'm holding the shipment.
I called today too, but if you're reading this,
please get in touch.
↑Done