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Caliper Brakes: Difference between revisions

From Bike Collectives Wiki

Revision as of 23:44, 7 January 2009

Also known as side pull brakes, there are two types of caliper brakes.

Single Pivot - The simplest form - both brake arms pivot about a single bolt that usually attaches the unit to the frame as well. Single Pivot Calipers also "track" an out of true, and or mis-dished rim without issue.
Dual Pivot - Each arm has it's own independent pivot bolt, and the unit attaches to the bike with a separate bolt. These can provide more mechanical advantage then the Single Pivot Caliper Brake. However, Dual Pivot Calipers perform poorly in situations where there is a mis-dished wheel, or a wheel out of true.

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[session] SessionManager using store APCUBagOStuff
[localisation] LocalisationCache using store LCStoreCDB
[session] SessionBackend "2r7vel93qrito5baeuptn9nmdjs2qdnv" is unsaved, marking dirty in constructor
[session] SessionBackend "2r7vel93qrito5baeuptn9nmdjs2qdnv" save: dataDirty=1 metaDirty=1 forcePersist=0
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[session] SessionBackend "2r7vel93qrito5baeuptn9nmdjs2qdnv" data dirty due to dirty(): MediaWiki\Session\SessionManager->getSessionForRequest/MediaWiki\Session\SessionManager->getInitialSession/MediaWiki\Session\Session->getToken/MediaWiki\Session\Session->set/MediaWiki\Session\SessionBackend->dirty
[session] SessionBackend "2r7vel93qrito5baeuptn9nmdjs2qdnv" save: dataDirty=1 metaDirty=0 forcePersist=0
[DBQuery] Wikimedia\Rdbms\DatabaseMysqlBase::open [0s] database_staging: SET group_concat_max_len = 262144, `sql_mode` = ''
[DBReplication] Wikimedia\Rdbms\LBFactory::getChronologyProtector: request info { "IPAddress": "172.18.0.2", "UserAgent": "Mozilla\/5.0 AppleWebKit\/537.36 (KHTML, like Gecko; compatible; ClaudeBot\/1.0; +claudebot@anthropic.com)", "ChronologyProtection": false, "ChronologyPositionIndex": 0, "ChronologyClientId": false }
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[DBReplication] ChronologyProtector fetching positions for 00aba87f0d2b34d22fa7da60bd405aff
[DBReplication] Wikimedia\Rdbms\ChronologyProtector::applySessionReplicationPosition: DEFAULT (database_staging) has no position
[DBConnection] Wikimedia\Rdbms\LoadBalancer::lazyLoadReplicationPositions: executed chronology callback.
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: opened new connection for local/0
[DBQuery] Wikimedia\Rdbms\Database::beginIfImplied (MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds) [0s] database_staging: BEGIN
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[SQLBagOStuff] MainObjectStash using store ReplicatedBagOStuff
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[DBQuery] WikiPage::pageData [0s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_random,page_touched,page_links_updated,page_latest,page_len,page_content_model FROM `mw_page` WHERE page_namespace = 0 AND page_title = 'Caliper_Brakes' LIMIT 1
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[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 6643 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::getRelativeRevision [0.001s] database_staging: SELECT rev_id FROM `mw_revision` IGNORE INDEX (rev_timestamp) WHERE rev_page = 2690 AND (rev_timestamp > '20090107234417' OR (rev_timestamp = '20090107234417' AND rev_id > 6643 )) ORDER BY rev_timestamp ASC,rev_id ASC LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 6644 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 6644 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 6643 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] DifferenceEngine::loadRevisionData [0s] database_staging: SELECT ct_tag_id AS `value` FROM `mw_change_tag` WHERE ct_rev_id = 6643
[DBQuery] DifferenceEngine::loadRevisionData [0.001s] database_staging: SELECT ct_tag_id AS `value` FROM `mw_change_tag` WHERE ct_rev_id = 6644
[MessageCache] MessageCache using store APCUBagOStuff
[MessageCache] MessageCache::loadUnguarded: Loading en... got from local cache
ParserFactory: using default preprocessor
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::getRelativeRevision [0s] database_staging: SELECT rev_id FROM `mw_revision` IGNORE INDEX (rev_timestamp) WHERE rev_page = 2690 AND (rev_timestamp < '20090107234417' OR (rev_timestamp = '20090107234417' AND rev_id < 6643 )) ORDER BY rev_timestamp DESC,rev_id DESC LIMIT 1
Unstubbing $wgLang on call of $wgLang::getDatePreferenceMigrationMap from Language->internalUserTimeAndDate
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Page\PageStore::getPageByNameViaLinkCache [0s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_touched,page_links_updated,page_latest,page_len,page_content_model FROM `mw_page` WHERE page_namespace = 2 AND page_title = 'Whizbo' LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Page\PageStore::getPageByNameViaLinkCache [0s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_touched,page_links_updated,page_latest,page_len,page_content_model FROM `mw_page` WHERE page_namespace = 3 AND page_title = 'Whizbo' LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::loadSlotRecordsFromDb [0s] database_staging: SELECT slot_revision_id,slot_content_id,slot_origin,slot_role_id,content_size,content_sha1,content_address,content_model FROM `mw_slots` JOIN `mw_content` ON ((slot_content_id = content_id)) WHERE slot_revision_id = 6644
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::loadSlotRecordsFromDb [0s] database_staging: SELECT slot_revision_id,slot_content_id,slot_origin,slot_role_id,content_size,content_sha1,content_address,content_model FROM `mw_slots` JOIN `mw_content` ON ((slot_content_id = content_id)) WHERE slot_revision_id = 6643
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[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::getRevisionIdsBetween [0.002s] database_staging: SELECT rev_id AS `value` FROM `mw_revision` WHERE rev_page = 2690 AND ((rev_deleted & 1) = 0) AND ((rev_timestamp = '20090107234417' AND rev_id > 6643) OR rev_timestamp > '20090107234417') AND ((rev_timestamp = '20090107234433' AND rev_id < 6644) OR rev_timestamp < '20090107234433') LIMIT 1001
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0.001s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE page_namespace = 0 AND page_title = 'Caliper_Brakes' AND rev_id = 6644 LIMIT 1
[ParserCache] Creating ParserCache instance for pcache
[ParserCache] Creating RevisionOutputCache instance for rcache
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::loadSlotRecordsFromDb [0s] database_staging: SELECT slot_revision_id,slot_content_id,slot_origin,slot_role_id,content_size,content_sha1,content_address,content_model FROM `mw_slots` JOIN `mw_content` ON ((slot_content_id = content_id)) WHERE slot_revision_id = 6644
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] LinkHolderArray::replaceInternal [0s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_latest,page_touched,page_len,page_content_model FROM `mw_page` WHERE ((page_namespace = 0 AND page_title = 'Brakes'))
ContextSource::getContext (MediaWiki\Skins\Vector\SkinVector22): called and $context is null. Using RequestContext::getMain()
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] OutputPage::addCategoryLinksToLBAndGetResult [0s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_latest,page_touched,page_len,page_content_model,pp_value FROM `mw_page` LEFT JOIN `mw_page_props` ON (pp_propname = 'hiddencat' AND (pp_page = page_id)) WHERE ((page_namespace = 14 AND page_title = 'Bicycle_Parts'))
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 6643 LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::getRelativeRevision [0s] database_staging: SELECT rev_id FROM `mw_revision` IGNORE INDEX (rev_timestamp) WHERE rev_page = 2690 AND (rev_timestamp > '20090107234417' OR (rev_timestamp = '20090107234417' AND rev_id > 6643 )) ORDER BY rev_timestamp ASC,rev_id ASC LIMIT 1
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\Revision\RevisionStore::fetchRevisionRowFromConds [0s] database_staging: SELECT rev_id,rev_page,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_actor,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `mw_revision` JOIN `mw_revision_comment_temp` `temp_rev_comment` ON ((temp_rev_comment.revcomment_rev = rev_id)) JOIN `mw_comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = temp_rev_comment.revcomment_comment_id)) JOIN `mw_actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `mw_page` ON ((page_id = rev_page)) LEFT JOIN `mw_user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) WHERE rev_id = 6644 LIMIT 1
[DBQuery] MediaWiki::preOutputCommit [0s] database_staging: COMMIT
MediaWiki::preOutputCommit: primary transaction round committed
[DeferredUpdates] DeferredUpdates::run: started MWCallableUpdate_WikiPage->doViewUpdates #765
[DeferredUpdates] DeferredUpdates::run: ended MWCallableUpdate_WikiPage->doViewUpdates #765, processing time: 8.4877014160156E-5
MediaWiki::preOutputCommit: pre-send deferred updates completed
MediaWiki::preOutputCommit: session changes committed
[DBReplication] Wikimedia\Rdbms\ChronologyProtector::persistSessionReplicationPositions: no primary positions/timestamps to save
[DBReplication] Wikimedia\Rdbms\LBFactory::shutdown: finished ChronologyProtector shutdown
[DBReplication] LBFactory shutdown completed
OutputPage::haveCacheVaryCookies: no cache-varying cookies found
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] Wikimedia\Rdbms\Database::beginIfImplied (LinkBatch::doQuery (for Skin::preloadExistence)) [0s] database_staging: BEGIN
[DBQuery] LinkBatch::doQuery (for Skin::preloadExistence) [0s] database_staging: SELECT page_id,page_namespace,page_title,page_is_redirect,page_is_new,page_latest,page_touched,page_len,page_content_model FROM `mw_page` WHERE (page_namespace = 1 AND page_title = 'Caliper_Brakes')
[DBConnection] Wikimedia\Rdbms\LoadBalancer::getLocalConnection: reused a connection for local/0
[DBQuery] MediaWiki\User\TalkPageNotificationManager::dbCheckNewUserMessages [0s] database_staging: SELECT user_ip FROM `mw_user_newtalk` WHERE user_ip = '172.18.0.2' LIMIT 1
[gitinfo] Candidate cacheFile=/var/www/html/w/gitinfo.json for /var/www/html/w
[gitinfo] Cache incomplete for /var/www/html/w

@@ Line 1: / Line 1: @@
 Also known as side pull brakes, there are two types of caliper brakes.
 *Single Pivot - The simplest form - both brake arms pivot about a single bolt that usually attaches the unit to the frame as well.  Single Pivot Calipers also "track" an out of true, and or mis-dished rim without issue.
-**Dual Pivot - Each arm has it's own independent pivot bolt, and the unit attaches to the bike with a separate bolt.  These can provide more mechanical advantage then the Single Pivot Caliper Brake.  However, Dual Pivot Calipers perform poorly in situations where there is a mis-dished wheel, or a wheel out of true.
+*Dual Pivot - Each arm has it's own independent pivot bolt, and the unit attaches to the bike with a separate bolt.  These can provide more mechanical advantage then the Single Pivot Caliper Brake.  However, Dual Pivot Calipers perform poorly in situations where there is a mis-dished wheel, or a wheel out of true.
 == See Also ==